View Single Post
Old 01-12-14, 04:15 AM   #7
Registered User
wheeljack12's Avatar
Join Date: Jun 2004
Location: Hamilton,Ontario,Canada
Posts: 1,203
Send a message via Skype™ to wheeljack12
Default Re: Major System Upgrade

I was wondering, why does like hwinfo64 show your video cards running at pci-e 3.0 x16 (8gb/sec) at pci-e x16 (2.5gb) which is wrong. Pci-e 3.0 x16 should show (16gb/sec) period. I notice this in gpu-z also where it shows pci-e 3.0 x16 running at 1.1. Especially on a x79 mb. I know that both of your cards (gtx 780 ti) can and should run at full x16 speeds due to having 40 pci-e 3.0 lanes unless you one or two more x8 cards in there somewhere. The only thing I can think of is that you may have one of your cards in the x8 slots slowing down the bandwidth between them. Read below and check your manual on which slots are which:

(this is the layout of the x79-up4 mb)
2 x PCI Express x16 slots, running at x16 (PCIEX16_1, PCIEX16_2)
* For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot.

2 x PCI Express x16 slots, running at x8 (PCIEX8_1, PCIEX8_2)
* The PCIEX8_2 slot shares bandwidth with the PCIEX16_2 slot. When the PCIEX8_2 slot is populated, the PCIEX16_2 slot will operate at up to x8 mode.
(All PCI Express x16 slots conform to PCI Express 3.0 standard.)

2 x PCI Express x1 slots
(All PCI Express x1 slots conform to PCI Express 2.0 standard.)

1 x PCI slot

which leaves me with the question: do you have something in the x8 slots or do you have just two gtx 780 ti's on the mb?
gigabyte z97x gaming gt mb, 8gb ddr3-1866 mhz ram in dual channel,intel core i7 4790 3.6 ghz quad core cpu, zotac gtx 970 4gb vc,OCZ vector 150 240 gb ssd x 2 in raid 0,evga 1200p2 1200watt 80 plus platinum psu,corsair carbide 500r white case,lg 16x bluray writer, steelseries 6gv2 keyboard ,seiki 39 inch 4k tv, zalman zm-gm3 8200 dpi mouse ,xbox 360 wired controller for windows,adata 16gb usb 2.0 flash drive,windows 8.1 64 bit,creative labs sound blaster zxr pci-e sc,logitech z906 5.1 speakers

I'd rather walk with God in the Dark than shine in the light alone.
wheeljack12 is offline   Reply With Quote