Thursday, December 22nd 2011
PCI Express 3.0 Has Zero Performance Incentive for Radeon HD 7970: Tests
Over the last few months, motherboard manufacturers have been raising a big hoopla over how it's important to pick their products that feature PCI Express 3.0 (Gen 3.0) slots. There was even some drama between competing motherboard manufacturers over who was first to the market with this technology, even when consumers couldn't really make use of the technology. To begin with, you needed a next-generation Ivy Bridge CPU, then you needed a compliant graphics card. Sandy Bridge-E, fortunately, formally introduced the technology, complete with motherboards and processors that support it.
GPU maker AMD wanted to be the first to be out there with a GPU that's compliant with this interface, and so one thing led to another, and VR-Zone got to set up a test-bed using Core i7 "Sandy Bridge-E", ASUS Rampage IV Extreme (which allows users to change PCI-Express standard mode in the BIOS setup program, by forcing Gen 2 or Gen 1 mode), and an HD 7970, to see if running the GPU on PCIe 2.0 and PCIe 3.0 modes made any worthwhile difference. The results are in: zero, nada, zilch, sunna (zero in my language).In its comparison, VR-Zone put the GPU through 3DMark 11 (a DirectX 11 graphics benchmark) and ComputeMark (a GPU compute shader benchmark that heavily loads system bus). The performance figures between the two were agonizingly insignificant. 3DMark 11 and ComputeMark are tell-tale tests of whether the GPU (and with it, its system interface) is at least getting loaded enough. You would much rather spend the money you saved to upgrade your current, perfectly-functional LGA1155 motherboard to an "ooh-Gen3" one, on a memory upgrade, before DRAM prices rebound.One area, however, where Gen 3.0 could have a performance incentive, could be with future Ivy Bridge LGA1155 platforms, where to run 2-way CrossFire, the single x16 link from the CPU is split into two PCI Express 3.0 x8 links. Those numbers could be interesting.
Source:
VR-Zone
GPU maker AMD wanted to be the first to be out there with a GPU that's compliant with this interface, and so one thing led to another, and VR-Zone got to set up a test-bed using Core i7 "Sandy Bridge-E", ASUS Rampage IV Extreme (which allows users to change PCI-Express standard mode in the BIOS setup program, by forcing Gen 2 or Gen 1 mode), and an HD 7970, to see if running the GPU on PCIe 2.0 and PCIe 3.0 modes made any worthwhile difference. The results are in: zero, nada, zilch, sunna (zero in my language).In its comparison, VR-Zone put the GPU through 3DMark 11 (a DirectX 11 graphics benchmark) and ComputeMark (a GPU compute shader benchmark that heavily loads system bus). The performance figures between the two were agonizingly insignificant. 3DMark 11 and ComputeMark are tell-tale tests of whether the GPU (and with it, its system interface) is at least getting loaded enough. You would much rather spend the money you saved to upgrade your current, perfectly-functional LGA1155 motherboard to an "ooh-Gen3" one, on a memory upgrade, before DRAM prices rebound.One area, however, where Gen 3.0 could have a performance incentive, could be with future Ivy Bridge LGA1155 platforms, where to run 2-way CrossFire, the single x16 link from the CPU is split into two PCI Express 3.0 x8 links. Those numbers could be interesting.
44 Comments on PCI Express 3.0 Has Zero Performance Incentive for Radeon HD 7970: Tests
update microcode, pcie gen 3.0 codes
Which are probably needed.
www.hardwaresecrets.com/article/AMD-Radeon-HD-7970-Video-Card-Review/1458/13
See the facts:
PCI-express 2 has at max 80GT/s
The card itself has 137GT/s
It can be an asus program failure too or bad programming
Look at pci-express and make a difference with 7970 in gpu-z
en.wikipedia.org/wiki/PCI_Express
It's no surprise, new standards never get utilized right away. They simply have to be there for companies to adopt and later on they will have added value. Same was true for PCI to AGP (banshee PCI or AGP, which is faster?), then to various AGP standards and then AGP vs PCIe, then PCIe 2.0 and now 3.0. All I can say is "doh".
Because of the bus?
dudes...guys... bro...
pci-e is not for GC only
so the development are not for GC exclusive
GC has been always have the best performance when the standard become common
not as a pioneer in pushing it
so the 1st pci-e 3.0 gc?
its like moving from a cramped apartment to a big mansion,
so much space now but it will get filled later on'
And as a couple people already mentioned, makes a significant difference in compute.
So, the tech is not enabled fully, and you got no performance increase. Well, blow me over, I cannot imagine why. :rolleyes:
Where can PCIe 3.0 be used, currently? INTER-GPU COMMUNICATION. Crossfire, with multiple cards. Higher bandwidth for inter-GPU communication is needed, period.
:shadedshu