Advanced search

Message boards : Graphics cards (GPUs) : Dual GPU

Post to thread Subscribe Sort
Author Message
Profile X-Files 27
Avatar
Send message
Joined: 11 Oct 08
Posts: 95
Credit: 68,023,693
RAC: 0
Level
Thr
Scientific publications
watwatwatwatwatwatwatwatwatwatwatwatwatwat
Message 6196 - Posted: 29 Jan 2009 | 23:22:22 UTC

If your mobo has x16 and x8 pci-e(link), does having 2 gpu powers down PCI-E_1 to x8? or should it run GPU1 @x16 and GPU2 @x8? This is single card mode not sli.
____________

ID: 6196 | Rating: 0 | rate: Rate + / Rate - Report as offensive    Reply Quote
Profile Paul D. Buck
Send message
Joined: 9 Jun 08
Posts: 1050
Credit: 37,321,185
RAC: 0
Level
Val
Scientific publications
watwatwatwatwatwatwatwatwatwat
Message 6197 - Posted: 29 Jan 2009 | 23:32:01 UTC - in response to Message 6196.

If your mobo has x16 and x8 pci-e(link), does having 2 gpu powers down PCI-E_1 to x8? or should it run GPU1 @x16 and GPU2 @x8? This is single card mode not sli.


what is the make and model of the MB so we can look it up?

ID: 6197 | Rating: 0 | rate: Rate + / Rate - Report as offensive    Reply Quote
Profile X-Files 27
Avatar
Send message
Joined: 11 Oct 08
Posts: 95
Credit: 68,023,693
RAC: 0
Level
Thr
Scientific publications
watwatwatwatwatwatwatwatwatwatwatwatwatwat
Message 6201 - Posted: 30 Jan 2009 | 1:33:20 UTC

Mobo: Asus P5Q-E
GPU: GTX 260
PSU OCZ 1000W EliteXStream
____________

ID: 6201 | Rating: 0 | rate: Rate + / Rate - Report as offensive    Reply Quote
Profile Paul D. Buck
Send message
Joined: 9 Jun 08
Posts: 1050
Credit: 37,321,185
RAC: 0
Level
Val
Scientific publications
watwatwatwatwatwatwatwatwatwat
Message 6202 - Posted: 30 Jan 2009 | 3:46:34 UTC - in response to Message 6201.

Mobo: Asus P5Q-E
GPU: GTX 260
PSU OCZ 1000W EliteXStream


In the English version of the manual (YMMV) page 2-21, you will be using the Blue PCI-e and the black PCI-e closest to the blue connector and both cards should run at full speed.

With a single card you would only use the blue connector ...

ID: 6202 | Rating: 0 | rate: Rate + / Rate - Report as offensive    Reply Quote
Profile X-Files 27
Avatar
Send message
Joined: 11 Oct 08
Posts: 95
Credit: 68,023,693
RAC: 0
Level
Thr
Scientific publications
watwatwatwatwatwatwatwatwatwatwatwatwatwat
Message 6204 - Posted: 30 Jan 2009 | 4:47:31 UTC - in response to Message 6202.


In the English version of the manual (YMMV) page 2-21, you will be using the Blue PCI-e and the black PCI-e closest to the blue connector and both cards should run at full speed.

With a single card you would only use the blue connector ...


Yup, thats my setup.

On the manual, Blue is x16 and Black is x8 ...when using single card on blue, link is x16. when using dual card on blue and black link is x8 and x8.

My question is why the blue is now operating at x8 not x16.
____________

ID: 6204 | Rating: 0 | rate: Rate + / Rate - Report as offensive    Reply Quote
J.D.
Send message
Joined: 2 Jan 09
Posts: 40
Credit: 16,762,688
RAC: 0
Level
Pro
Scientific publications
watwatwatwatwatwatwat
Message 6205 - Posted: 30 Jan 2009 | 5:45:04 UTC - in response to Message 6204.


My question is why the blue is now operating at x8 not x16.


The Asus P5Q-E uses the Intel P45 Express Chipset. This chipset only supports x16 PCI-E for a single slot. For two slots, it redistributes the available PCI-E channels across both slots, so you have 2 slots at x8.

With the P45, these slots are PCI-E version 2.0, so at x8 each of them can still push about 4 GB/sec.

ID: 6205 | Rating: 0 | rate: Rate + / Rate - Report as offensive    Reply Quote
Post to thread

Message boards : Graphics cards (GPUs) : Dual GPU

//