Master&Puppet
New member
Interesting - I haven't got a copy of FC3 yet. I'm surprised that it you found it CPU bounded! I've found that micro-stuttering is often solved by using vsync, have you given that a go?
Yea that was the: 7950 Royal King FC3 performance examplar.He ran the Royal King at stock which means it had a factory overclock (GPU Clock: 880 MHz; GPU Boost clock: 930 MHz) so it's going to be probably 10-20% faster than you can get on a 7870 with a big overclock I'd guess. That might explain some figures.
Na he was right when he was talking about the xfire vRAM. AMD cards use alternate frame rendering. I.e. Card A renders frames 1,3,5,7,9... whilst card B renders frame 2,4,6,8,10... etc. Each frame is only rendered by a single card (therefore only has access to one card's worth of vRAM) but because the other card is rendering the next frame each card has twice as long to do it's work which theoretically therefore doubles the FPS.
When MSI AB measures the vRAM use you can see how it gets confused because it sees 4GB of vRAM being used to make the frames at the same time (even though the cards are working on separate frames). In reality you've just got 2x2gb working on separate frames. If you added a third card AB would see up to 6gb of vRAM being used etc.
Yea that was the: 7950 Royal King FC3 performance examplar.He ran the Royal King at stock which means it had a factory overclock (GPU Clock: 880 MHz; GPU Boost clock: 930 MHz) so it's going to be probably 10-20% faster than you can get on a 7870 with a big overclock I'd guess. That might explain some figures.
Na he was right when he was talking about the xfire vRAM. AMD cards use alternate frame rendering. I.e. Card A renders frames 1,3,5,7,9... whilst card B renders frame 2,4,6,8,10... etc. Each frame is only rendered by a single card (therefore only has access to one card's worth of vRAM) but because the other card is rendering the next frame each card has twice as long to do it's work which theoretically therefore doubles the FPS.
When MSI AB measures the vRAM use you can see how it gets confused because it sees 4GB of vRAM being used to make the frames at the same time (even though the cards are working on separate frames). In reality you've just got 2x2gb working on separate frames. If you added a third card AB would see up to 6gb of vRAM being used etc.
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