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AMD Vega Graphics Cards Spotted In Linux Drivers, Including Dual GPU Liquid Cooled Board

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May 11
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A liquid cooled dual GPU Radeon RX Vega graphics card has been spotted in a brand new Linux driver released by AMD yesterday. Linux drivers have consistently proven to be an invaluable source of information regarding the company’s upcoming next generation Vega graphics products. The just released update to the open-source Linux graphics driver stack contains some very revealing code pertaining to the company’s latest and greatest graphics chips.

Dual GPU AMD Radeon RX Vega Graphics Card Spotted In Linux Drivers

First things first, the code. A number of very interesting new code lines have been added courtesy of yesterday’s patch and discovered by one keen-eyed redditor.

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table->Tliquid1Limit = cpu_to_le16(tdp_table->usTemperatureLimitLiquid1);

table->Tliquid2Limit = cpu_to_le16(tdp_table->usTemperatureLimitLiquid2);

The two lines of code above have been added to AMD’s Linux open-source driver stack yesterday, alongside two brand new Vega device IDs. The new Vega 10 IDs are 0x6864 and 0x6868 and seeing as how they’ve been added this close to launch the new IDs very likely pertain to actual finalized or near finalized Vega graphics boards.

Now, back to the dual GPU Vega board. Digging deeper the into the Vega 10 power management and temperature sensor code the reddit user discovered another gem.

table->FanGainPlx = hwmgr->thermal_controller. advanceFanControlParameters.usFanGainPlx;

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table->TplxLimit = cpu_to_le16(tdp_table->usTemperatureLimitPlx);

What you’re looking at is code specific to a PLX chip, found in the Vega 10 code stack. A PLX chip is an ASIC that splices PCIe lanes to bridge multiple components. They’re used in dual GPU graphics boards to connect the two graphics processors together and then drive that signal to the PCIe slot.

In other words, get ready for a brand new Radeon Pro Duo flagship graphics board from RTG. This time powered by the all new Vega 10 GPU. AMD is set to take the covers off Vega at an event on May 16th, less than a week from now.

AMD Vega 10 & Vega 11 GPUs

Graphics CardRadeon R9 Fury XRadeon RX 480Radeon RX 580Radeon RX Vega SeriesRadeon RX Vega SeriesRadeon RX Vega Pro Duo
GPUFiji XTPolaris 10Polaris 20Vega 11Vega 102x Vega 10
Process Node28nm14nm FinFET14nm FinFETFinFETFinFETFinFET
Stream Processors409623042304TBA4096Up to 8192
Performance8.6 TFLOPS
8.6 (FP16) TFLOPS
5.8 TFLOPS
5.8 (FP16) TFLOPS
6.1 TFLOPs
6.1 (FP16) TFLOPs
TBA12.5 TFLOLPS
25 (FP16) TFLOPS
TBA
TBA
Memory4GB HBM8GB GDDR58GB GDDR5TBA8GB HBM216GB HBM2
Memory Bus4096-bit256-bit256-bitTBA2048-bit4096-bit
Bandwidth512GB/s256GB/S256GB/STBATBATBA
TDP275W150W150WTBA<250WTBA
Launch20152016Q2 20172017Q2 2017TBA

Vega Architecture Key Features

– 2x Peak FP16 Throughput/Performance Per Clock
– 2x FP32 Performance/Watt, 4x FP16 Performance/Watt
– High Bandwidth Cache
– 2x Bandwidth per pin
– 8x Capacity Per stack (2nd Generation High Bandwidth Memory)
– 512TB Virtual Address Space
– Next Generation Compute Engine
– Next Generation Pixel Engine
– Next Generation Compute Unit optimized for higher clock speeds
– Rapid Packed Math
– Draw Stream Binning Rasterizer
– Primitive Shaders

You can read about the Vega architecture in full detail here.

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