I do not know how Maxwell responds to this, I never had it to test and I've never ran into someone who is willing to test things like I might. This means there is serious performance lost, and great care should be considered when picking cards for multi-GPU. the reference 1080 may throttle to 1750MHz at 1440p high FPS gaming while the Strix may be capable of 2000MHz at the same point) then both cards will be downclocked to match the slower card. If one card is overheating (Pascal responds to temperatures heavily and will throttle boost before even approaching the thermal limits) or hitting a TDP limit while another card is fine (for example, a Reference 1080 card's maximum allowed TDP limit is 180W, whereas an ASUS Strix 1080 is 400W, if you ran them in mGPU the reference will throttle/not hold boost, as well as overheat, far more than the Strix ever will. but then you wouldn't be using this recommendation anyway would you?Ĥ - If one card is clocked differently than the other on Pascal GPUs, SLI will still not function asynchronously.
You would not need these PSUs for just two cards unless you're a very serious overclocker with a top-end CPU (i7-4790K/6700K/7700K are NOT top end) and two top-end GPUs. Lots of dual GPU users I've seen (not saying all of them do) tend to go for 850W or 1000W PSUs. Most cards will work easily on a much smaller wattage PSU once it's good quality. Since these cards are no longer made however, you're far better off just buying a newer generation single card for any situation.ģ - You usually do NOT need 800W+ PSUs for most dual GPU SLI solutions. So the two single cards which comprise the multi-gpu card will always be better to purchase, however the dual-gpu card works on motherboards with only one PCI/e x16 slot. They also often cost the same as OR MORE THAN two of the cards that comprise it, for example 2 x 680 = ~$1000 at release, and 1 x 690 = ~$1000 at release. They also use weaker versions of the flagships of its generation (usually through downclocks) for each of the GPUs in the dual GPU card. "8GB" of vRAM.Ģ - Dual GPU cards (like the GTX 590 and 690) ARE using SLI. You will only have 6GB usable vRAM in games/renders/etc. It does NOT have 12GB of available vRAM, it has 6GB on each card. Also, please be wary of the fact that most multi-gpu cards are sold with the TOTAL vRAM listed as the selling point. Because of this, pairing a 4GB card with say a 2GB card for example does not work. If a game wants to use 2GB, it won't put 1GB in GPU 1 and 1GB in GPU 2. If you have two 1GB video cards, the data in GPU 1 is copied to GPU 2, and thus you only ever benefit from 1GB of video memory. There are large differences and I am not in a position to explain in-depth about CrossfireX.įirst, I will clear up some fairly common misconceptions about SLI.ġ - Your video memory is not added or shared. Also note that I have never attempted to Crossfire any cards, so this guide is MAINLY directed toward SLI, and while most of the ups/downs will be common to both SLI and CrossfireX, THIS IS NOT A CROSSFIRE GUIDE. This will list pretty much everything you will ever want to know about SLI in as great a detail as I can possibly create.
#SLI CROSSFIREX READY UPGRADE#
It's mainly geared toward people who have midrange or last generation cards who wonder if they should get multiple cards or simply upgrade to a stronger one.
Original guide (no longer updated there) is over at īasically, this is a guide meant to explain the upsides and downsides of SLI. I have never used and therefore cannot say that all of these will hold true for CrossfireX. This is a real-world, layman's terms assessment of what SLI does and how it works. This forum is more lively and thus I figured it'd be good to copy over my guide for all to read. I originally wrote this guide over at the kbmod forums, but as it turns out that forum is as dead as Aeris in FF7.
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