Gadgetory

in your quest for the highest frame rates the prettiest textures in the most karma in the pcmasterrace subreddit you decided to go with a multi GPU setup for your new gaming rig but when you fire up your games you notice that the sick games you're getting aren't really what you expected especially after dropping so much money on your system so what's the deal with that well this problem has plagued PC gamers for over a decade why don't you usually get double the performance from a dual card configuration or triple if you have three video cards I mean since graphics rendering benefits from having more computing units in parallel which you can learn more about in this video by the way wouldn't it make sense then for multi card setups like SLI and crossfire to scale pretty easily unfortunately it's not quite that simple for starters using two separate graphics cards means they have to talk to each other somehow you see most modern multi-gpu setups use something called alternate frame rendering where each card renders every other frame separately sounds efficient but for them to be pushed to your monitor in the right order the cards have to sync up properly creating a surprising amount of overhead for both the GPUs and the electrical communication paths or buses that link them this overhead not only gets worse as you add more cards to your rig but can even result in a very unpleasant phenomenon called micro stuttering which often shows up even if you're getting lots of frames per second you see for smooth gameplay you need not only high FPS but good and consistent frame times which is the amount of time that a given frame will remain on your screen poor synchronization between the cards can leave certain frames on your monitor for way longer than they and be even if the total number of frames each second is very high this can render certain games unplayable even though your setup is more than powerful enough to run it on paper and as if that wasn't enough an even bigger problem is that it's very difficult for your GPUs to know what frame to render next since it depends heavily on what the player chooses to do the real-time nature of game rendering makes it tough to parallel eyes in certain games among multiple GPUs even with alternate frame rendering as there isn't always a second frame or even part of a predicted one for your second card to work on of course it isn't all about the inherent limitations of your hardware on the software side some game developers have been able to code their games in a manner that makes it easier for multiple GPUs to split the workload while others simply don't bother with the difficulty in coding for a very small subset of customers many devs don't see the point in sinking tons of time into making sure that their games will play nice with multi card systems some games even managed to have worse performance in these situations and finally you definitely shouldn't run out and buy multiple GPUs if you're rocking a multiple monitor setup and you want extra video memory or vram to store all of your textures with SLI and crossfire you are limited only to however much vram is on one card because both GPUs need to be able to access the same information in memory in order to work properly in tandem whatever it might say on the packaging so does this mean then that SLI and crossfire are useless gimmicks and a complete waste of money well no multi card setups will give you the best possible performance in certain use cases and can even make some games playable at very high settings and resolutions where they wouldn't otherwise be you even with the best single card on the market not to mention that multi-gpu rendering may improve with new AP is like Vulcan and directx12 which by the way you can learn more about here just do your research before you buy as to what game see the greatest benefit and remember to keep your expectations realistic after all you wouldn't expect to be able to drive twice as fast 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