6990 + 6970 Crossfire

msaunders · 19 Aug 2011 at 17:01

Hi Folks

I picked up a Sapphire 6970 today from an older card I had to RMA a few months back ( yes it took months)

Anyway I have a HIS 6990 in my current setup and i want to try the 6970 in trifire .. just a few quick questions

With the 6990 in my primary PCIe slot and the 6970 in the second:

Do I need to use 1 or 2 xfire bridges ?
Which card then do I connect my monitors too , or does it matter ?

Thanks !

Final8y · 19 Aug 2011 at 17:12

Your monitors go on the primary card which is the 6990.

msaunders · 19 Aug 2011 at 17:17

Thanks ! What about the bridges ? Do I just need the 1 ?

subbytna · 19 Aug 2011 at 17:20

Is there anything that your 6990 is struggling with? Seems a bit overkill imo but sure it's new tech goodness

msaunders · 19 Aug 2011 at 17:25

subbytna said:
Is there anything that your 6990 is struggling with? Seems a bit overkill imo but sure it's new tech goodness

Hi . Not as such no . I do plan to upgrade to a 27" monitor soon so that is when it will kick in I assume ..

Final8y · 19 Aug 2011 at 17:27

msaunders said:
Thanks ! What about the bridges ? Do I just need the 1 ?

Only 1 is needed but 2 wont hurt.

msaunders · 19 Aug 2011 at 17:50

Thanks Final8y , out of interest what monitor are you using ?

Final8y · 19 Aug 2011 at 17:58

2 x NEC 20" MultiSync LCD2090UXi 1600x1200
1 x NEC 30" MultiSync LCD3090WQXI 2560x1600
1 x Pioneer 50" KURO PDP-LX5090 not in shot.

johny dolan · 19 Aug 2011 at 19:08

The 6990 only has a single bridge but xfire only needs a single bridge.

I fitted a block to my 6990 because it got toasty and loud especially when next to the 6970 but they scale well and the performance gains are worth it.

msaunders · 19 Aug 2011 at 19:33

Thanks johny . I was wondering how this will impact temps seeing as they are literally side by side with only a few mm between cards , if even that .

rubin1961 · 19 Aug 2011 at 19:34

How toasty mate

slade · 20 Aug 2011 at 09:09

Show off!! (wish i had that)

Steves1982 · 20 Aug 2011 at 16:50

That's some serious screenage!

Jealous

BaDBoY_uK · 20 Aug 2011 at 20:48

I have a similar setup. 3 x 26" Iiyamas and a 50" LG LCD

Be careful with it. No games will utilise 99% of each GPU. BC2 in 6048x1200 maxed uses only 60% of each!

Do I need to use 1 or 2 xfire bridges ?

1! The 6990 only has one bridge connector

Which card then do I connect my monitors too , or does it matter ?

Depends. I have the 6970 as the primary card and my 6990 as the secondary. Either way, use the primary one only. It is not nvidia!

Good luck

Final8y · 20 Aug 2011 at 21:10

I can get 80% of each GPU Quadfire in UT3 with Super Sample & 24x AA Edge Detect.

gareth170 · 20 Aug 2011 at 21:52

msaunders said:
Thanks johny . I was wondering how this will impact temps seeing as they are literally side by side with only a few mm between cards , if even that .

temp should be fine if u have good air flow.

on my old board the cards only had afew MM and the temps was 78c~ 80c 82c on auto fan.

gareth170 · 20 Aug 2011 at 21:58

msaunders said:
With the 6990 in my primary PCIe slot and the 6970 in the second:!

i would say put the 6970 my primary PCIe slot and the 6990 in the second because that way if a game as issues with CF u will be able to disabled CF

gareth170 · 20 Aug 2011 at 22:00

Final8y said:
Only 1 is needed but 2 wont hurt.

6990 only as 1 bridge connector mate.

Final8y · 20 Aug 2011 at 22:18

gareth170 said:
6990 only as 1 bridge connector mate.

Yeah i forgot.

msaunders · 21 Aug 2011 at 14:36

gareth170 said:
i would say put the 6970 my primary PCIe slot and the 6990 in the second because that way if a game as issues with CF u will be able to disabled CF

But if there were issues with CF would it not fall back to the 6990 card as its in the primary PCIe slot ?