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4890 Crossfire not giving any noticeable improvement.

Alexrose1uk said:
That looks a lot better.
To give you a comparison, my single 4870 was hitting about 8-9k with a quad running higher clocks (crossfire likes clock speed).
I'd say you're still a bit limited by the looks of it; but it seems your computer is now actually benefitting from the second card some, AFAIK a single 4890 usually hits around 9-10k GPU score, so you're actually getting something from the second card in vantage now :)

Whack on a game or two, and see whether your actual game results seem better :)
Click to expand...


Right, I think I'm ok now, I bought me an aftermarket cooler and I'm now running the E6750 stably at 3.4MHz. I fired up Empire: Total War and I now get a difference of around 20fps with/without crossfire enabled. Thanks for all your help with this guys, much appreciated :)

One final question: I was reading some guys thread over at the ATi forums saying that a 650W PSU will not even cope with Crossfired 4870s and that I could well be looking at an expensive paperweight in a couple of months from now. Any truth to this? :confused:
 
Glad to hear you got it sorted. I think the main problem here is also that you are playing some of the very few games in which crossfire does not scale incredibly well. Try out some popular FPS titles and hopefully you'll see close to 90-100% scaling.

As for the 650W PSU, it depends on the make but in general it should be just fine. What is the make/model ?
 
Yeah, I think you're right about my game collection. Ironically, I just picked up Aion last night thinking "Ahhh great! this title utilises the CryEngine, a perfect opportunity to flex me new 4890s" ...only to discover that it has known issues with Crossfire!!! Not having much luck so far, am I? hehehe... :rolleyes:

My PSU is this one ~ will it cut it?
 
Should be fine, multiple, solid rails with decent amperage. A lot of fear comes from Psu aging, allowing over head and the number of cheap, generic PSU available.
 
absolutely. Its the PSU's fault seems to be such a regular cry by people. Not all PSU' are built equal and the best ones can run a lot more than cheap ones with the same wattage rating. The Corsair website suggests the HX520W upwards for 2 4890's and a quad core set-up for example.
 
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