I have purchased 2 radeon HD4870 and have them enabled with, what I can only presume is all the right bits. Crossfire-enabled MB, crossfire links, etc.
However, I can't see any difference in Game speeds at all. I have tried some stuff with one 4870 card in; Crysis, GTA4, Total war, 3dMark; and the system performs ok. But when I put in the second 4870 card, it makes no difference at all. Maybe a 1% increase in 3dMark.
Is this normal? Or is there something I'm not doing right. Bit gutted really as it seems to have been a huge waste of money.
I'm currently running:
P45 Platinum MB
Intel Quad-core 2.33Mhz
2Gb DDR2 ram
2 x HD4870 1GB
ATI Catalyst 9.3 (the latest one)
Also, there seems to be lots of people complaining about crossfire in roughly the same way as me.
Are there any crossfire users out there experiencing good performance? I'm not rubbishing crossfire or anything - I just want to know if I should keep trying to get it to work or just be happy with the 1% performance increase...
Forget the games. You will not get a performance increase in games if you don't in 3D Mark. It takes full advantage of CF. Anyway, there was a thread a while ago about a guy benchmarking 4870 3CF. In certain games, there were performance increases. That might help.
Thanks everyone for all your help. It's all academic now, I'm afraid as my Motherboard has blown, it seems. Just makes three low pitch beeps, then turns off, then tries to turn on again. And repeat...
I'm going to return it as I'm not sure now if this motherboard (p45 platinum) is fully compatible with the crossfire setup. - even though it says so on the box. It mentions something about a whopping 8% VGA performance increase, which seems to be about the performance increase I'm actually getting.
So, I will be on again to let you know.
Any ideas for a Intel Core 2 Quad - compatible crossfire motherboard?
I get the same 3DMark score and framerate when running at 1080p as I do when running at 640x480.
Surely, this isn't normal? Maybe the same score, but there shouldn't there be a much better framerate?
The downloadable, free version of 3DMark's software always runs at the same resolution, and you can't change that. Even if you set your monitor to a specific resolution, the software runs the tests at whatever pre-set resolution is hard-coded within it. So the answer to your question is, yes, this is normal. Just a little something most users overlook when it comes to benchmarking with a free synthetic like 3DMark's products. Only the PAID versions of their software allow things like resolution to be altered.
Sorry to hear the mobo died... an X38 or X48 is probably the route to go. You'll likely see prices in the $150 to $200+ range.