PCI Express bandwidth

[roachyuk]

ok been reading up on boards for a new one and came across this

(Note 2) For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16_1 slot; if you are installing two PCI Express graphics cards, it is recommended that you install them in the PCIEX16_1 and PCIEX16_2 slots.
(Note 3) The PCIEX8_1 and PCIEX8_2 slots share bandwidth with the PCIEX16_1 and PCIEX16_2 slots espectively. When PCIEX8_1 is populated with an expansion card, the PCIEX16_1 slot will operate at up to x8 mode; when PCIEX8_2 is populated with an expansion card, the PC IEX16_2 slot will operate at up to x8 mode.

Now i am using the pci express x8_1 on my board so this means the pci express 16 _1 which my graphics card is in is running at x8...is this bad for my graphics card performance being a at 5870...anyone got any ideas thanks.

 

[Rroff]

Aslong as its PCI-e 2.0 spec (check with GPUz) then a 5870 won't be in any significant way held back by x8 speed.

 

[Reaper 392]

there is barely any noticable difference between crossfire or SLI at x16, x16 and x8, x8. it was tested with some high end graphics cards (GTX580's i believe) and there was literally no difference in framerate when the games were going at maximum graphics.

i assume this is what you are doing, and you dont have something else in the first PCIe x16 slot

 

[roachyuk]

i have my 5870 in first 16_1 slot then my asus xonar in the 8_1 slot which reduces the 16 slot speed to 8 i believe.