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Just as the Vulkan API isn't currently implemented into DOOM (2016) in the public build, SLI support is also missing at the moment. This is unfortunate for those with high-end multi-GPU PCs built to power the latest titles at 4K/UHD resolutions but support is on the way, according to one of id Software's developers.
Writing over on Twitter, Tiago Sousa, id Software's Lead Programmer behind the id Tech 6 Engine and DOOM addressed calls for SLI support and explained why it isn't in the game right now. It turns out that there is an issue with Shadows limiting scaling of multiple graphics cards in SLI.
There has been talk of the id Tech 6 engine just not supporting SLI at all but that doesn't appear to be the case here. We don't know exactly when the SLI update is coming though, nor do we know if this also applies to AMD's CrossFire.
In the mean time, if you're stuck with using one card, then you can check out our DOOM analysis and benchmarks, which went up earlier this week. However, do note that while AMD's R9 390 and R9 290 performance was poor at launch, a driver came out yesterday aiming to fix performance for these cards specifically.
KitGuru Says: DOOM is an excellent game but it does seem that quite a few are waiting for SLI support to enjoy it at higher resolutions. We have reached out to Nvidia to see if they can give us any idea on when we may see SLI support added to the game but we haven't heard back yet so for now, just keep an eye out for any patches as support is definitely on the way.
For at least the past Five years the Motherboard manufacturers have been churning out EXCELLENT High-performance (dual x8 x16) motherboards built specifically more Modern Dual-GPU Gaming. So, as they have been bought, then there MUST be millions of customers waiting to make use of dual GPU; especially when you consider the cost of a second (older) GPU, compared to a 4K monitor and/or a brand new GPU for existing games collections.
What I mean is; I can buy a used GTX 770/780/780Ti/970/980 or the AMD R9 280 etc etc etc equivalent, for as little as under $100 (for all except the used 980). And for the AVERAGE 1080p monitor, that is perfect. But to get DOOM (4) in 4K, I would need at least $500-$800 for a 4k monitor where I live, and add on to that another $600 for a 980Ti or ($700+)GTX1080, which would make gaming a profession-grade cost experience, and not a spare-time enjoyment.
Crossfire/SLi makes a lot of sense.