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Old April 24, 2011, 10:00 AM
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Default Thinking about adding a 5870 to my 5850, need some advice....

I'm putting together my new Sandy Bridge 2500k / Asus P8P67 rig. I already have a 5850 that's clocks 900/1250 with absolutely no problems, and I now I have the chance to buy an almost new XFX non-reference 5870 for $160CAD/$170 CAD depending on if I get it mailed or delivered, I just have a couple of questions/concerns before I pull the trigger....

1. My new board only does 16x/4x crossfire, from what I researched the 4x doesn't affect crossfire performance, what are your thoughts?

2. Since I my 5850 ocs to above 5870 clock speeds, would it bottleneck the 5870 that much?

3. Which card should I use as the primary on the 16x lane? Would the non-reference cooler of the XFX come into consideration?

4. I'm using three 32" 720p TVs for eyefinity resolution of 4080x768. It looks fantastic but I'd like to have higher AA in newer games like Crysis 2 and Shift 2 and then eventually BF3 since my resolution is inherently limited. My 5850 struggles a bit, would this new setup allow me to do my resolution with good AA with ease?

5. Is this a good price for 5870? lol

Thanks in advance guys, any help would be appreciated.
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Old April 24, 2011, 12:43 PM
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I don't think mixing cards is the best idea... Crossfire in general has it's own instability issues and mixing cards will likely only make this worse.

Honestly you're better off buying a single faster card and not rely on Crossfire. SHIFT2 doesn't even use Crossfire (the Catalyst App Profiles disable it) and Crysis 2 is supported very poorly (usually causes flickering, and as far as I can tell no performance gain).

I thought adding a 2nd 5870 to my setup was an ideal solution a few months ago after getting a U2711 (2560x14400), but really it wasn't. I had tried Crossfire once before with HD4850s and was disappointed, and now with HD5870s, I see not much progress has been made.

I think you'll be happier with a HD6950/70 or GTX570/80.
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Old April 24, 2011, 01:46 PM
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the 4x slot will be a bottleneck, but not that major,i think.

the 5870 will be held back a bit by the lesser card.

depending on the title,as per jd here, itll show an improvement or not.

what psu do you have again?

and 160 picked up is a good deal for that card..as long as it works.
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Old April 24, 2011, 07:43 PM
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Quote:
Originally Posted by _dangtx_ View Post
the 4x slot will be a bottleneck, but not that major,i think.

the 5870 will be held back a bit by the lesser card.

depending on the title,as per jd here, itll show an improvement or not.

what psu do you have again?

and 160 picked up is a good deal for that card..as long as it works.
I have a Tru Power 650 watt...
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Old April 24, 2011, 07:46 PM
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you'll be ok.
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