Posted 12 April 2012 - 11:35 AM
coastie65, on 12 April 2012 - 10:46 AM, said:
waldojim, on 12 April 2012 - 09:10 AM, said:
Actually Brian, how much did you read on that? The PCI-E controllers for the video card are all contained in the CPU. Once upgraded to PCI-E 3.0, as long as the motherboard has the switches, and signaling capable of 3.0 speeds, it is good to go. Somewhere down the thread they mention all this. Motherboard vendors, Intel, AMD, and Nvidia didn't have enough testing materials between them to certify motherboards as being 3.0 compliant. However, most of them are.
Yeah, I forgot to mention the controller factor. I believe the controllers on the 2011 Socketed processor will do 3.0 ( 8GT/s ) as will the Ivy Bridge. The Sandy Bridge is at 4.5 GT/s and I don't know if it can be raised or not or if even if it would be worth the effort. I don't think Brian really read that thread through, or didn't understand what was being said. As t what was said that you wouldn't see the difference between 2.0 and 3.0, because of the wider bandwidth, I would have to question that. I know that using a 2.0 Card in a 1.0 slot, you give up about 3% on the performance, which isn't all that bad I suppose. I believe the signaling & swiches are in the Chipset itself where as the controllers are in the CPU.
You know, the interesting thing here, is that the differences that were seen on 1.0 to 2.0 were within the margin of error. Back when the first 2.0 cards were being tested (8800GTX?), the cards weren't powerful enough to saturate the PCI-E 1.0 spec. Shoot, at the time, they still couldn't saturate AGP 8x. Last I heard, the 4670 from AMD (SEVERAL generations after the 8800GTX) is the ONLY card that can actually saturate the AGP connection. Shoot, even today, with PCIe 2.0, it is hard to justify more than an 8x link. With 5% or less performance drops, the average person would never see it. With the slightest OC offsetting that slight difference in bandwidth.
The most notable improvement you are going to have moving to 3.0 spec, is going to be with SLI. Running 4 way SLI, all the cards will have effectively the same bandwidth as the 2.0 x16spec, even though they are all running x8 links.
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