Will Installing PCIE SSD Slow GPU?

calcalocalo · Jul 8, 2016

My current rig is an Intel i5 3570k @4.0ghz, MSI GTX 1070 installed on a GA-Z77X-D3H motherboard.

Reading the description for my motherboard installing an ad on, like an SSD, into my second PCIE slot will cause them to split bandwidth and run both slots at x8 instead of x16. If I were to buy a Samsung 950 evo M.2 and install in the second slot would either my GPU or SSD be running at non optimal speeds due to the pcie 3.0 x8 instead of the x16?

William Henrickson · Jul 8, 2016

If VRAM is maxed out, data has to move in and out of the PCI express bus to CPU/main memory.

If not, no problem!

giantbucket · Jul 8, 2016

highly unlikely, since your current GPU is probably not maxing out the bandwidth of all 16 lanes at PCIE 3.0 speeds. and since 8x @ PCIe 3 is the same as 16x @ PCIe 2.0, and few cards can even saturate that, you should be A-OK.

rgd1101 · Jul 8, 2016

http://www.gigabyte.com/products/product-page.aspx?pid=4144#sp

Expansion Slots
1 x PCI Express x16 slot, running at x16 (PCIEX16)
* For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot.

1 x PCI Express x16 slot, running at x8 (PCIEX8)
* The PCIEX8 slot shares bandwidth with the PCIEX16 slot. When the PCIEX8 slot is populated, the PCIEX16 slot will operate at up to x8 mode.

1 x PCI Express x16 slot, running at x4 (PCIEX4)
* The PCIEX4 slot shares bandwidth with the PCIEX1_1/2/3 slots. The PCIEX1_1/2/3 slots slots will become unavailable when a PCIe x4 expansion card is installed.

3 x PCI Express x1 slots
(PCIEX4 and PCIEX1 slots conform to PCI Express 2.0 standard.)

1 x PCI slots

If you don't have anything else other then the gpu, use slot 3.

synergon · Nov 1, 2016

i have the same board and on pciex 4 the ssd only gets 1700MB/s on the x8 it gets the 3500MB/s but the GPU (gtx 1080) runs only at x8 i dont know if it makes any difference in graphic performance and i dont understand why the x4 limits the ssd

rgd1101 :

William Henrickson · Nov 1, 2016

Your X4 is PCIE 2.0, which is half the speed of PCIE 3.0, which is on the main ports.

My bus interface usage has never been above 30% in any game ever, use the second slot and don't worry about x8 3.0, same speed as x16 2.0

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