Originally Posted by joatguru
Does the memory size matter? 1GB/2GB/4GB... if it better to go for better faster GPU or more memory.
I guess the answer gets rather complicated and it's dependent on what you want to do with it.
If you want to do only HTPC stuff then it matters some. For advanced stuff like MadVR or video games it matters more. 4GB is not a great idea for good iGPU performance, since you will share some for the iGPU and that means there is not much left. You might find yourself wanting 8GB. Also the speed matters too, for iGPU you can get some real world performance boosts (10% or greater) with more memory and faster memory (1866mhz+ and 2400mhz is best). This is true for AMD and even more true for Haswell. I''m not a fan of DDR3 1600mhz, and I would never use 1333mhz or 1066mhz ever. Especially since the cost for the better stuff is small.
On a dedicated GPU memory still matters but if you overbuy a card for the purpose then it won't matter much.
Example: You buy just enough card to play the games you want at the resolutions you want you will see a benefit going from a 1GB GPU card to a 2GPU card in frame rates or performance. But if you overbuy your video card for the intended purpose the lower ram is enough.
For max MADVR you need a minium of Nvidia 650Ti or Radeon HD7770 or R7 260. You are better off getting the small step up (2GB cards and HD7790/ R7260X) since they do show some additional benefits in extreme madVR (like 1080p video) or in video games at 1200x1920 resolutions.
If you are looking at something like a RADEON R9 class then the memory won't matter too much as the card is more than needed for 1080p gaming or any madvr. But again, it might matter at 1440p gaming.
So the answer is rather complicated but obviously there is a benefit to more RAM.
If you are looking at a card where the 2GB version is $20 more than the 1GB version I think it's a no brainer, but for $50 perhaps not. (then again $50 often gets you the next higher card up)
For good iGPU performance you want 8GB of 2400mhz, this would only matter to gamers or someone wanting MadVR or SVP.
A simple Celeron or cheap AMD dual core with 1600mhz will play back 1080p video fine, so in that case it won't matter. It all depends on what you want to do.