5770 Crossfired (PCI-E 2.0 x16 & x4)

[NineLives]

I was stupid and didnt spend an extra 10 dollars for a motherboard with 2 x16 PCI-E slots XD

So my 1st 5770 is in the 16x slot ATM, but when I get my other card it will go into the x4 slot.
Has anyone crossfired any ATI/AMD card with x16 & x4 PCI-E slots?
I just want to know if there was a performance gain or loss, because spending like $100 for my performance to worsen would piss me off :S

here is a link to my motherboard: Newegg.com - ASUS M4A87TD EVO AM3 AMD 870 SATA 6Gb/s USB 3.0 ATX AMD Motherboard

I already ordered my second 5770, should I be worried?
I read somewhere that some guy felt a big difference, but does anyone know for sure?

[Arinoth]

You shouldn't notice that much of a difference, at most you'd see it in benchmark, even at that it would be significantly. I speak from experience where iwas running 6870 in crossfire eyefinity on a H67 board (2500 processor) and noticed no visually noticeble frame losses compared to it running in my standard machine (x16 x16 in 1366 rig).

[NineLives]

Originally Posted by Arinoth

You shouldn't notice that much of a difference, at most you'd see it in benchmark, even at that it would be significantly. I speak from experience where iwas running 6870 in crossfire eyefinity on a H67 board (2500 processor) and noticed no visually noticeble frame losses compared to it running in my standard machine (x16 x16 in 1366 rig).

wait really lol you're running 6870's crossfired on 16x and 4x PCI-E 2.0??!?!!?
Hows the performance? I mean how much more performance do you get from one card to two cards?

[Arinoth]

Originally Posted by NineLives

wait really lol you're running 6870's crossfired on 16x and 4x PCI-E 2.0??!?!!?
Hows the performance? I mean how much more performance do you get from one card to two cards?

While my 1366 board was being RMAed, i was testing out crossfire eyefinity on it. I never benchmarked at all however performance wise in games i was able to keep the same high settings on games i was playing prior on my 940 @ 3.8 without any noticeable slow down in frames. Only difference i noticed in frames was moving from 6870s to 560s (1366 platform)

[Dr_BenD_over]

I had x16/x4 CF... I went and spent the money to go x8/x8. It works, but you may notice a LOT of CPU overhead depending on your motherboard.

[Stock]

I think there's a benchmark somewhere on Techpowerup about running at x4... you're looking at a 5% performance hit give or take. How that translates into FPS? Probably 2-3.

[NineLives]

Originally Posted by Dr_BenD_over

I had x16/x4 CF... I went and spent the money to go x8/x8. It works, but you may notice a LOT of CPU overhead depending on your motherboard.

I have a Phenom II x4 955 at 3.2ghz..

what video cards did you have crossfired?

I am not going to buy a new mobo, getting my HSF for my CPU was a pain in the ass, it took like an hour!

Also do you mean my CPU will take a lot of the load and will be more used?

[jcmaz]

doesn't more cpu overhead mean less of the cpu is used?

And are these opinions the same for sli Nvidia cards?

[NineLives]

Originally Posted by jcmaz

doesn't more cpu overhead mean less of the cpu is used?

And are these opinions the same for sli Nvidia cards?

Yeah thats what I was thinking lol!

Maybe he got mixed up rofl.

[Dr_BenD_over]

I'm going back to 3870's on a P965 based mobo, x16 on the NB, x4 on the SB. (and SLI'd 6800's despite N's lack of support)

Since when did more mean less...