1029th of the month，AMD holds an online press conference，Released RX 6800/6800 XT/6900 XT 3 graphics cards in total。The release of RX 6000 series graphics card，It's of great significance to AMD，It is the first step for AMD to return to the high-end graphics card market in a few years。What made people exclaim was this time AMD finally caught up with his old opponent in terms of performance，Instead of talking about the cost-effectiveness of the graphics card again and again after releasing it。Of course, cost performance is important，But with the guarantee of efficiency，Let's talk about cost-effectiveness and be more confident。
Since the release of RX 6000 series graphics card，The A/N comparison sound is endless，First of all, the price of the public version is based on the price，The RX 6800 and the RTX 3070 are almost not on the same level，The most likely encounter is RX 6800 XT and RTX 3080，How effective are they，We will also test in detail in the following article。
AMD's flagship graphics card RX 6900 XT will be lifted next month，We don't know the performance，However, according to AMD's official PPT introduction，It will be a terrifying existence。What black technology does the RX 6000 series graphics card use to make its performance soar，We will explain it to you one by one in a while。Due to this RX 6800 and RX 6800 XT is released together，So the evaluation is also combined into one，First, let's look at the appearance。
RX on outer packaging 6800 XT is more refined，Magnetic gift box design，Open the lid and read "Welcome to the red team"，The box also adopts a double-layer embedded design，All sides have inclination，Quite exquisite。
The appearance of the graphics card itself，RX 6800 and RX 6800 XT is almost exactly the same，Adopt 3 9-leaf large fans，Length is 267mm Width is 120mm，Better compatibility with existing host shells。Silver and black color matching on the front of the graphics card，The black part of the border is made of matte。
From the side view，The difference between the two cards is quite obvious，RX 6800 XT is significantly thicker due to enhanced heat dissipation design，Compared to RX 6800, the thickness is approximately 0.5 more slots。
The two models on the back of the graphics card adopt the same design，The whole is silver metal back panel，The surface is frosted，There is a capital R in the lower right corner as the logo。
RX 6800 XT's cooling design is thicker:From the side view，The difference between the two cards is quite obvious，RX 6800 XT is significantly thicker due to enhanced heat dissipation design，Compared to RX 6800, the thickness is approximately 0.5 more slots。
The two models on the back of the graphics card adopt the same design，The whole is silver metal back panel，The surface is frosted，There is a capital R in the lower right corner as the logo。
Another small detail is Radeon's logo design，View RX from the picture 6800 XT uses transparent and red backlight，And the RX 6800 is red，But both have backlights，There is not much difference after getting on the machine。The two graphics cards have a circle of red stripes on the side borders.，The saturation of the color is quite high and very eye-catching。
RX 6800 and RX 6800 XT all use 8+8pin power supply solutions，However, the RX 6800 consumes 250W while the RX 6800 The power consumption of XT is 300W。
The interface part has the same two cards，4 interface design for DP1.4*2+HDMI 2.1+Type-C，This time, both A/N companies upgraded HDMI interface to 2.1，This also means that the era of full 8K is coming soon，But at present, the burden on graphics cards of 8K games is still too high.。
Let's take a look at the design of RDNA2 architecture，From GCN architecture to RDNA architecture，Power consumption ratio increased by 50%，The power consumption ratio from RDNA architecture to RDNA2 architecture can be increased by up to 54%。What kind of black technology does the new RDNA2 architecture use? I believe everyone is very curious。
Before talking about architecture, we have to mention the legendary figure of one bit - David Wang。AMD released HD7970 graphics card in 2011，At that time, I won many "firsts"：The first GPU graphics chip using a 28nm process、The first DX11.1 graphics card is supported、The first PCIe 3.0 interface graphics card，This graphics card uses the GCN architecture。Although GCN looks relatively backward now，But at that time it was a very advanced architecture，The person who developed this architecture is Mr. Wang Qishang。
After the GCN architecture was successful, he retired and was replaced by Raja，But since then we also know that the GCN architecture has been used for 7 years，During this period, the gap with the old opponent gradually became apparent。at this time，Wang Qishang received an invitation from AMD again，Save people from "defense"，The RDNA2 architecture announced at the press conference was developed by this legendary figure.，Can GCN be created again?，Let's wait and see。
However, from the test results，Improvements in RDNA2 architecture almost tied the gap over many years，And this is just the first generation graphics card with this architecture，I believe in the next few years，RDNA still has great potential to discover。OK, let's talk about the architecture here，Let’s take a look at what innovations are there in the RDNA2 architecture.。
First on the wafer area，The Navi 10 of the previous generation of RDNA architecture is 251 square millimeters，The chip area of Navi 21 reaches 536 square millimeters，113% times that of the previous generation，What does such a large area increase mean? Double the number of CUs (COMPUTE UNIT) in the RDNA2 architecture，From the previous generation of 40 to RX 6800 80 CUs in XT，This is the main reason for the area growth。But it does not mean that RDNA2 is just a simple heap CU number。
We also noticed from the press conference，This time, the general frequency of RX 6000 series graphics cards is around 2000MHz，RX 6900 The acceleration frequency of XT reaches an astonishing 2250MHz，1.3 times that of the previous generation RX 5000 series。
Also in each CU，The RDNA2 architecture is also the first time that AMD has joined the ray tracing technology DirectX Raytracing (DXR). The unit responsible for ray tracing is Ray Accelerators (ray accelerators)。
We all know to calculate ray tracing，First, the shader emits a ray tracing request，Leave it to Ray Accelerators for processing，It will perform two tests，Box Intersection testing and Triangle Intersection testing respectively。Based on the BVH algorithm to judge，If it is a square，Then go back to narrow the scope and continue testing，If it is a triangle，Then the feedback result is rendered，During this period, their calculation ratio is 4:1。As for the actual effect and frame rate changes in the game，We will conduct detailed tests for you later。
This time, the RX 6000 series graphics card still uses GDDR6 graphics memory throughout the entire series，The memory bit width is 256bit，But the bandwidth is 2.17 times that of the 384bit GDDR6，At the same time, power consumption is reduced by 10%，This is the black technology Infinity Cache with RDNA2 architecture。
Infinity Cache is a breakthrough technology from AMD，It can be said that the RX 6000 series graphics card can have such performance，Infinity Cache makes a big contribution。In the new RX 6000 series graphics card，All with 128MB Infinity Cache，It changes the transmission pipeline of GPU data，As a huge bandwidth amplifier，This global cache technology allows for quick access to data，Make video memory bandwidth more efficient。
Smart Access Memory is referred to as SAM，It is also a black technology launched by AMD，And this technology can only be implemented on the 3A platform，That is to say, on AMD's CPU、motherboard、Graphics card simultaneously，Only SAM bonus，According to AMD，You can achieve up to 13% frame rate increase in the game。Please see the related introductionAMD SAM technology detailed explanation
However, there are prerequisites to use SAM.，The newly released Ryzen 5000 series CPU is required to use it with RX 6000 series graphics card，It also requires the X500 series motherboard to support this function (the motherboard manufacturer needs to update the BIOS，Users do not operate on their own)。
This technology is actually a principle of CPU direct video memory，Traditional CPUs can only read 256MB of video memory at a time when processing data，And SAM technology can eliminate this bottleneck，PCIe bandwidth is fully utilized，Expand the data channel，All video memory can be read at once，We will also conduct test comparisons below。
In addition, the overclocking preset in AMD driver has been addedRage Mode (Raging Mode)，After selecting this mode, the graphics card can increase TGP by up to 6%，Or increase the TGP of the graphics card used to the maximum limit。The improvement effect of Rage Mode will be due to graphics card TGP、Variation between parts and applications。If it is a non-public graphics card，According to training between different manufacturers，The improvement effect will also be different。Currently this mode is only in RX 6800 Exist in XT，RX 6800 is not supported yet。
For this test platform, we chose the CPU of Ryzen9 5950X，The motherboard is MSI MPG X570 Darkboard，And RX 6800/6800 XT。
On test scores，Benchmark tests using 3DMARK，Game performance test uses the game's own Benchmark，To reduce errors，Each test score is averaged 3 times。Before testing, let's take a look at the detailed parameters of the two graphics cards，Since we reviewed two products this time，Convenient for comparison and review，The author made a brief summary：
Both graphics cards use Navi 21 chips，But the specific model is different，We see that the RX 6800 has a 60-unit computing unit，And RX 6800 XT is 72，So some other parameters also change accordingly，Stream Processor、Ray accelerator、Computing power、Grating/texture unit, etc.。
However, the parameters of the two graphics cards are the same in terms of graphics memory，16GB GDDR6 video memory，256 bit width，Bandwidth 512 GB/s，Infinity Cache為128MB。In addition, both graphics cards are 267×120mm in size，Just the thickness is different。In addition, power consumption，RX 6800 is 250W，RX 6800 XT is 300W，The recommended power supply for both is 650W/750W respectively。
In this test, we selected NVIDIA GeForce RTX 2070/2080/2080 Ti/3070/3080 and AMD Radeon RX 6800/6800 XT has 7 graphics cards for comparison and testing。The following is a 3DMARKFS set used to measure the theoretical performance of graphics card DX11：FS，FSE，The graphics card of FSU is 1080P respectively、2K、4Theoretical effectiveness of K，The actual test results for taking the graphics card score are as follows：
In the 3DMARK FS package test for graphics card DX11 environment，RX 6800 XT score advantage is obvious，22% higher than RTX 3080 in FS single item；FSE is 20% higher；FSU height 16%。RX 6800 The higher XT score is what we expected，But what is unexpected is that most of the RX 6800 scores exceed RTX 3080，Just exceeded by RTX 3080 in FSU with 4K resolution，The following scores also confirm this point，At super high resolution，NVIDIA RTX 30 Series Graphics Cards have obvious advantages。
In the Time Spy and Time Spy Extreme tests for DX12 environment，RX 6000 Series Graphics Card has no advantages，TS scores with RTX 3080 and RTX 2080 Ti is basically the same，But there was a slight fall in the 4K resolution。The gap between RX 6800 is more obvious，If the RTX 3080 is used, there is a lot of difference.，But it's much higher than RTX 3070。
In tests for real-time ray tracing，RX 6800 The score gap of XT is quite obvious，27% behind RTX 3080，But this result is expected，NVIDIA Ampere architecture further optimizes RT Core based on the previous generation of Turing architecture，Strive to achieve the pursuit of the whole nation。AMD has just launched the ray tracing function，There are still many things to explore。
In addition, one-click overclocking is included in the AMD driver，The software will determine the overclocking amplitude based on the physical condition of the graphics card.，RX after overclocking 6800 XT frequency is increased to 2474MHz (default 2250MHz)，Let's take a look at the score performance in 3D MARK。
In FS and TS packages in 3D MARK，The performance after overclocking is about 1%，In PortRoyal for ray tracing test，The improvement results after overclocking are about 4%。The following three pictures are RX 6800 FS after XT overclocking、TS、Comparison of ray tracing results：
game test：in playtest，We chose the newer Borderlands 3、"Dust 5" and "Galaxy Breakers" will test the running scores of 7 graphics cards.。
In "Borderlands 3"，We choose the highest preset villain quality，Among them RX 6800 XT is 17% higher than RTX 3080 at 1080P resolution，210% higher at K resolution；43% higher at K resolution。Although the RX 6800 outperformed RTX in theoretical tests 3080，But there is still a difference in the scores in the game，But it's still higher than RTX 3070。
It is not difficult to find that the higher the resolution, the more obvious the advantages of RTX 3080，Although it has 16G video memory，But compared with the RTX 3080 using GDDR6X，The bandwidth is still slightly smaller。
Dust 5 is a game just launched，Through the test results, we can also find that AMD's optimization is quite good，RX 6800 XT is 41% higher than RTX 3080 at 1080P resolution；2K resolution is 25% higher；4K resolution is 19% higher。And in this game, the score of RX 6800 has also caught up with it，Scores are 15% higher than RTX 3080 at 1080P resolution，2K resolution is 14% higher；4K resolution is 1% higher。Although each item has advantages，But it is not difficult to find that the higher the resolution, the stronger the RTX 3080 is chasing.。
"Galaxy Breaker" is a 2.5D God-like RTS game，Combining the management and construction model of "The Lone Gunner" and RTS games as a child，New game mode。Since it is 2.5D, the score is very high without consecrating the ray。RX at 1080P resolution 6800 XT is 16% higher than RTX 3080，2K resolution is 16% higher，4K resolution is 10% higher；The RX 6800 is slightly ahead compared to the RTX 3080。
Added a new test of ray tracing in "Galaxy Breakers"，In addition, since this game is in the early stage of experience，There are still many incomplete content，There is no preset for the picture quality setting，Therefore, the author will list the display settings for everyone to check。
The frame rate test is carried out in the ray tracing environment，In the screen setting，We open the ray tracing option，The quality of ray tracing is adjusted to the highest，And turn on variable rate shading。
Also in the test of turning on ray tracing，RTX 3080 leads again，21% advantage at 1080P resolution，2There is a 33% advantage in K environment，There is a 39% advantage in 4K environment，The ray tracing test score of RX 6800 is lower than that of RTX 3070。
In "Galaxy Breakers", you can see the huge difference between the ray tracing effect after it is turned on and off.，Of course there are huge differences in frame counts.，Screenshot from RX 6800 XT's running score test，The number of instant frames to turn off ray tracing is 207 frames，The number of frames after turning on ray tracing is 68 frames。
Power consumption and temperature test：
Room temperature 24°C in temperature and power consumption test，Use a test platform to simply test the heat dissipation of the graphics card itself。
In power consumption test，GPU-Z currently only has chip power consumption，RX 6800 XT is about 270W；RX 6800 is about 220W，The whole card power consumption results are obtained by the power consumption meter test。
Power Consumption Comparison：In the official information，The entire card power consumption of RX 6800 is 250W, and the recommended power supply is 650W.；RX 6800 The power consumption of XT is 300W, and the recommended power supply is 750W.，Judging from the actual test results，Basically in line。
Temperature comparison：In terms of temperature testing，Both graphics cards are tested by FurMark copying software，Among them, RX 6800 is 70℃ in a relatively normal range，But RX 6800 XT is 82℃，The temperature is a bit too high，In addition, the speed of the graphics card fan is always maintained at around 30-40%.，Lower than the 70℃ speed of RX 6800。
I have to say that the performance of the RX 6000 series graphics card is amazing，It also means a lot for AMD，It is the first step in AMD's return to the high-end graphics card market after several years。And what makes people exclaimed is that this time AMD finally caught up with its old rivals in terms of performance，Instead of talking about the cost-effectiveness of the graphics card again and again after releasing it。
Compared with RX 5000 series, the RX 6000 series also achieves the magic of double performance.，And they fought back and forth with NVIDIA in this contest，Out of everyone's expectations。The topic returns to our opening content，A/N comparison has always been something that everyone likes to hear，Then pass this test，The biggest feeling I feel can be summarized briefly in the following points。
If you compare the cards of A/N companies，N card is more like a dragon spring sword with iron-cutting like mud，Accurately in place；A card is a big opening and closing，Rough and powerful。In terms of hardware conditions，The RX 6000 series graphics cards can be described as ingenious in design，Especially the addition of Infinity Cache，Let GDDR6 memory bandwidth directly catch up with GDDR6X。But it's still very AMD in terms of software，Some games still have problems。
Currently, the bonus of Smart Access Memory is limited to Ryzen 5000 Series CPU and RX 6000 Series graphics card，And AMD officially revealed，There is no plan to introduce this technology into previous generation hardware combinations.，The purpose is to do more development and testing on the latest platforms，Maximize functionality。If you fix the game optimization and bugs，It is a high-end graphics card with very cost-effective performance。
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