Upgrading GPUs & MOBO, need advice on 4 slot PCIE setup

I want to upgrade my motherboard to a 4 slot PCIE one and get two HD7950's or HD7970's. I already have two HD6770's crossifred. I want to know if I could run a pair of 7950's or 7970's crossfired as my main GPUs and use my old 6770's as extra GPUs (For dedicated bitcoin mining). When I'm not using the PC I want to run the 7950's or 7970's (not in crossfire mode) along with the two 6770's for bitcoin mining and maximize my hash rate outputs for bigger profits. Is this possible? Having two sets of different cards and having them detected properly.

Not seeing much in choices, this is highest cost AMD AM3+ board with 4 PCIe, but they are 2 16x, 2 8x, no idea on effectiveness of those, never have even crossfired or SLI'd 2 let alone 4.

ASUS Crosshair V Formula-Z ATX AMD Gaming Motherboard with 3-Way SLI/CrossFireX Support and UEFI BIOS - Newegg.com

Krypted said:

I want to upgrade my motherboard to a 4 slot PCIE one and get two HD7950's or HD7970's. I already have two HD6770's crossifred. I want to know if I could run a pair of 7950's or 7970's crossfired as my main GPUs and use my old 6770's as extra GPUs (For dedicated bitcoin mining). When I'm not using the PC I want to run the 7950's or 7970's (not in crossfire mode) along with the two 6770's for bitcoin mining and maximize my hash rate outputs for bigger profits. Is this possible? Having two sets of different cards and having them detected properly.

If you are going with 7900 cards the 6700's wouldn't even be a factor here

You can't add 2 cards the same make and 2 other cards that aren't on that tier level you would confuse the hell out of the drivers or better yet crash it

sell the other 2 cards for a decent price there is no need to even update a board for 4 way because you would be wasting money

Here you go https://bitcointalk.org/?topic=6575.0

Above wasn't about 4 way CF i'm saying it is highly unlikely that combination would work

you can fill all your GPU slots but that doesn't mean they will play nice with each other

As mentioned in the article as well it only works with the same GPU's in crossfire using multi GPUs has to be in the same Tier level for them to work like that


I want a direct link to this article copy and pasting does no good here also if they were already using strong cards along with the low end cards pretty much the 6770's will stay idle and pretty much never be used

Solarstarshines said:

Krypted said:

I want to upgrade my motherboard to a 4 slot PCIE one and get two HD7950's or HD7970's. I already have two HD6770's crossifred. I want to know if I could run a pair of 7950's or 7970's crossfired as my main GPUs and use my old 6770's as extra GPUs (For dedicated bitcoin mining). When I'm not using the PC I want to run the 7950's or 7970's (not in crossfire mode) along with the two 6770's for bitcoin mining and maximize my hash rate outputs for bigger profits. Is this possible? Having two sets of different cards and having them detected properly.

If you are going with 7900 cards the 6700's wouldn't even be a factor here

You can't add 2 cards the same make and 2 other cards that aren't on that tier level you would confuse the hell out of the drivers or better yet crash it

sell the other 2 cards for a decent price there is no need to even update a board for 4 way because you would be wasting money

Plus1 to that. I would use the "KISS" principle and look to Crossfired 78 or 79 series only. As mentioned you are only headed towards major complex grief the other way....but I can't speak from having tried that only crossfired two cards several times! Each mobo, CPU, GPU (s), drivers will react uniquely but the first thing that enters my mind is why when the performance of lets say two 7970's will be crazy high.

Krypted said:

I think people are getting confused about what I'm wanting. The only thing I want to use the 6xxx cards for are mining bitcoins. The 7xxx cards would be used for everyday use except for overnight I plan to use them for mining bitcoins also (not in crossfire setup). I want to do this so I can dedicate two cards to mine bitcoins 24/7 and be able to use my PC for work/gaming at the same time using the primary 7xxx cards in crossfire setup. Overnight when i sleep I plan on un-crossfiring the 7xxx cards to mine bitcoins with the 6xxx cards. So I need to confirm that I can crossfire two 7xxx cards for primary use and install two 6xxx cards that would be detected/used by the bitcoin mining app.

We fully understand what you are trying to do the problem is your not understanding us they simply don't work that way sure you can disable crossfire to the more powerful cards but still they will be shown as the dominate GPU

What you are looking for is programs that allows GPU trickery to make it work when it shouldn't work