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  1. #1
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    Default To crossfire or not ?

    I have a pair of 4870X2's mounted in the first two 16x pci-e slots with the crossfire bridge.
    How would it affect performance if I put the 2nd card down onto the 8x slot near the bottom of the motherboard disabling crossfire ? (to aid cooling)
    What will the 2nd card be doing as it is not then helping its brother in crossfire ?.

    The reason I ask is that having 2 cards jam-packed together makes them run a bit hot.............I hold down the temps when gaming by raising the fans on each card to around 75% keeping temps down to about 50C, otherwise they creep up to around 70-80C. and just worried about the longevity of the cards as it will be when a blue moon appears before I will be able to buy new gfx cards

    Thanks in advance for any info.
    Windows 10-64bit-Windows 7 Home-64bit - Phanteks Primo case - Corsair HX850i PSU - Gigabyte Z170X Gaming G1 - i7-6700K(Bios F21) - Corsair H110i GTX AIO cooler - Corsair LPX 2 x 8GB 2666Mhz memory - Creative ZxRi Onboard sound - 2 x Samsung 950 256GB Nvme 256GB M.2 - 1 x Samsung 850 EVO 250GB SSD - 1 x Intel 750 400GB Pci-e - EVGA GTX FTW ACX2.0 980Ti - Dell 27" G-Sync 2560 x 1440 (main) - Dell 24" (secondary) 1920 x 1200 monitors.

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    If you remove your second card from the Crossfire configuration, naturally your performance will then only be what you get from a single card. You may as well just take the second card out of your system altogether in that case.
    Main: i5 2500K@4.6GHz w/Zalman CNPS10X Performa, Intel DZ68BC, 8GB G.Skill DDR3-1600, PNY GTX 470 + EVGA GTX 470, ASUS Xonar DX, ADATA S510 120GB, Samsung 1TB F3+1TB F1+2TB F4, Kingwin LZG 1kW, Lian-Li PC-9F, Dell U2212HM+S2209W, Win7 Professional.
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    Benchmarks have shown that 8x8 crossfires are just as fast as 16x16 crossfires. Why don't you try to find a longer crossfire bridge, maybe you can get the crossfire to work with one of the cards in that 8x slot.

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    Many thanks for the replies.
    Yep I have read that running as 8x8 in CF doesn't show any noticeable drop in performance.
    I shall have a look for a 100mm CF bridge, as I believe they can be bought.
    Windows 10-64bit-Windows 7 Home-64bit - Phanteks Primo case - Corsair HX850i PSU - Gigabyte Z170X Gaming G1 - i7-6700K(Bios F21) - Corsair H110i GTX AIO cooler - Corsair LPX 2 x 8GB 2666Mhz memory - Creative ZxRi Onboard sound - 2 x Samsung 950 256GB Nvme 256GB M.2 - 1 x Samsung 850 EVO 250GB SSD - 1 x Intel 750 400GB Pci-e - EVGA GTX FTW ACX2.0 980Ti - Dell 27" G-Sync 2560 x 1440 (main) - Dell 24" (secondary) 1920 x 1200 monitors.

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    MSI makes some long crossfire bridges. You can probably find some on e-bay. From everything I have read there isn't a significant hit between 16/16 and 8/8.

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    Got a 100m bridge off ebay, and mounted the 2nd card in the 3rd pci-e slot.

    I have not noticed any degradation in performance, but I have noticed a little drop in temp's of the two cards.......I think my two cards love me a bit more now that there is plenty of space between the two.............well worth the investment of a few pounds...
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    I have no idea if they would benefit cooling but they are cheap. I'm thinkinking the slot coolers might help? Anyone have any opinions?
    These are exhaust blowers that fit in expansion slot. Or do they just interfere with airflow?

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    Quote Originally Posted by walterm View Post
    I have no idea if they would benefit cooling but they are cheap. I'm thinkinking the slot coolers might help? Anyone have any opinions?
    These are exhaust blowers that fit in expansion slot. Or do they just interfere with airflow?
    This depends on how your airflow is configured really. And most of these blowers are pretty much junk anyway.
    Intel i7-2600k with an XSPC Raystorm water block, 4x4GB Corsair Dominator, SLi Evga-GTX560Ti-448 FTWs, Asrock Extreme4 Gen3, Crucial M4 256GB SSD, Samsung Spinpoint F3 1TB HDD, powered by a Silverstone Strider+ 850 PSU in a Silverstone TJ-07BW case.
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