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Nvidia RTX 3080: PCIe 4.0 vs 3.0 scaling analysis

By the time you are reading this, RTX 3080 reviews will be live and we will know exactly how fast this new Ampere GPU really is. But what about PCIe 4.0 – does it make a difference? Were we wrong to use Intel's Comet Lake-S platform for our RTX 3080 review data? Let's answer that question by directly comparing RTX 3080 performance on AMD's X570 platform with PCIe 4.0, versus Intel Z490 and PCIe 3.0.

Watch video via Vimeo (below) or over on YouTube at 2160p HERE

If you haven't already read our full RTX 3080 review, I would recommend doing so first. That will give you an idea of how this new GPU compares to the likes of the RTX 2080 Ti, GTX 1080 Ti and more. In this article, we are only looking at performance of the RTX 3080, but tested on different CPU platforms.

Here, we are comparing three sets of data. First of all, the data we used for our review – the RTX 3080 Founders Edition tested with an Intel i9-10900K overclocked to 5.1GHz, restricting us to PCIe 3.0 due to the Z490 platform. To give us an idea of PCIe Gen4 performance with this GPU, we turn to AMD's Ryzen 9 3900XT and the X570 platform. As a final data set, we also force PCIe 3.0 while testing with the Ryzen 9 3900XT.

GPU RTX 3090 RTX 3080 RTX 2080 Ti (FE) RTX 2080 SUPER RTX 2080 (FE)
SMs 82 68 68 48 46
CUDA Cores 10496 8704 4352 3072 2944
Tensor Cores 328 272 544 384 368
RT Cores 82 68 68 48 46
Texture Units 328 272 272 192 184
ROPs 112 96 88 64 64
GPU Boost Clock 1695 MHz 1710 MHz 1635 MHz 1815 MHz 1800 MHz
Memory Data Rate 19.5 Gbps 19 Gbps 14 Gbps 15.5 Gbps 14 Gbps
Total Video Memory 24GB GDDR6X 10GB GDDR6X 11GB GDDR6 8GB GDDR6 8GB GDDR6
Memory Interface 384-bit 320-bit 352-bit 256-bit 256-bit
Memory Bandwidth 936 GB/Sec 760 GB/Sec 616 GB/sec 496.1 GB/sec 448 GB/sec
TGP 350W 320W 260W 250W 225W

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