PDA

View Full Version : GT/s transfer rate nvidia cards



illicitFTW
08-26-2009, 09:54 PM
Hi to all i am new to the Xtreme Systems forum so hi to all,

I am in a bit of a pickle over the GT/s transfer rate for nvidia cards, I came across this web site http://www.sisoftware.net/index.html?dir=qa&location=cpu_vs_gpu_mem that showed me the MB/s transfer rate, but what I am trying to find out is how many GT/s from GFX card to the MOBO individual nvidia cards utilize as i am trying to get the most out of my system hope that make sence. if you are able to point me in to the right direction or even how to measure it I would realy appreciate your feedback.

Thanks

System Spec

E8500 at 4.5 ghz air cooled and stable
780i MOBO
1X500 GB hdd
1x 9800 GTX+ GPU 810 RAM 2.4 GHZ
1066 DDR2 corsair Ram
thermalright 120 heatpipe cpu cooler
Corsir 1000W PSU

largon
08-27-2009, 08:15 AM
There are no card-specific figures for PCIe link utilizations. The amount of data going through depends on many variables such as FPS, texture size vs. VRAM capacity, multi-GPU communication, etc.

PCIe link GT/s -figure = PCIe link freq (GHz).
->

PCIe 1.n x16: 2.5GT/s, and as such the bandwidth is:
16bit/s × 2.5GHz × (8b/10b) = 4GB/s (unidirectional)

PCIe 2.0 x16: 5GT/s, and as such the bandwidth is:
16bit/s × 5GHz × (8b/10b) = 8GB/s (unidirectional)