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

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May 11, 2017
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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;

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 Lineup

Graphics Card Radeon R9 Fury X Radeon RX 480 Radeon RX Vega Frontier Edition Radeon Vega Pro Radeon RX Vega (Gaming) Radeon RX Vega Pro Duo
GPU Fiji XT Polaris 10 Vega 10 Vega 10 Vega 10 2x Vega 10
Process Node 28nm 14nm FinFET FinFET FinFET FinFET FinFET
Stream Processors 4096 2304 4096 3584 4096 (?) Up to 8192
Performance 8.6 TFLOPS
8.6 (FP16) TFLOPS
5.8 TFLOPS
5.8 (FP16) TFLOPS
~13 TFLOLPS
~25 (FP16) TFLOPS
11 TFLOLPS
22 (FP16) TFLOPS
>13 TFLOLPS
>25 (FP16) TFLOPS
TBA
TBA
Memory 4GB HBM 8GB GDDR5 16GB HBM2 TBA TBA TBA
Memory Bus 4096-bit 256-bit 2048-bit 2048-bit 2048-bit 4096-bit
Bandwidth 512GB/s 256GB/S 480GB/S 400GB/S TBA TBA
TDP 275W 150W TBA TBA TBA TBA
Launch 2015 2016 June 2017 June 2017 July 2017 TBA

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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