Originally Posted by allikat
Actually Phaedrus, there can be a grey area with GPU power.
There's a point when the card is getting enough power to run 2d clocks, but not enough for full 3d clocks. That can cause a lot of tricky to diagnose trouble for people who don't know what furmark or kombuster are.
Most GPUs do go for a full power test as they start up, but that's always at a point when the motherboard is still in a pretty low power use state. It is possible (but unlikely) that a pair of graphics cards could be pulling more than the motherboard is willing to supply when it's fully fired up, but usually that just ends up with melty 24 pin connectors, not faults like this.
Add in the fact that Xfire in any ATi card before the 6000 series is almost always awful beyond any words OCN will allow, and software Xfire is worse still, and you're in a world of annoyance.
Well darn, I just now saw your post, sorry for being late.
You seem to know the most out of all who have posted here so far.
About furmark, I was just being lazy and didn't want to run it. Seeing just better bench scores wasn't what I was looking for, seeing more FPS in my games was. So, I just ran a few furmark benchmarks and a short stress test, along with cinebench. I closely monitored the voltages and saw that the 12v only dropped down to 11.98v, so that probably rules out my theory on the PSU not being adequate. However, I'm still scoring lower in both cinebench and furmark with crossfire as appose to a single card. Yes, both cards where running full power, I actively monitored each card's clocks and they were both running 3D clocks "according to GPU-z". With that, I haven't found any program or game that has taken advantage of software crossfire at all... besides the fact there Was micro stutter in some of them.
So here's what I'm getting at: either my motherboard has something wrong with it's link between the two PCI-e 16x bays, software crossfire really is terrible beyond what I’ve read from people who have it, or it could be do to the fact the two cards don't have identical BIOSes "sucky part of buying them almost a year apart". Whatever the problem is, I'm getting tired of hassling with it. I'm just going to stick with my GTS 250 for now and let my little sister use the new 4670 for her games. Perhaps the old one would make a good gift for a friend in need
.Edited by bullet937 - 1/25/11 at 2:17pm