R7 370 2gb vs 4gb for 2560x1080 gaming

[TimThePCMasterRace]

Hi, I'm starting the build on my new very budget skylake gaming pc(I'm 16 btw). I have done a lot of research on all of the parts I'm getting but i can't find any information about 2560x1080 gaming, I just love the idea of wide screen gaming and so i decided to get a LG 25UM55-P. The only problem is I don't know whether it would be worth it to get the 4gb version over the 2gb version for about $30(please keep in mind that I am on a very tight budget and $30 is really a stretch for me). I have read on some forums that the card is not even powerful enough to utilize 4gb, on other forums I have read that DirectX 12 will favor the graphics card over the cpu, so that may help the graphics card to use all 4gb of its vram? If you guys could help me decide you would really be helping me out a lot.
My PC specs are as follows:
Please feel free to make suggestions

Cooler Master B, 500w: Power supply
Cooler Master Elite K281: Case
Wd caviar blue 1tb: Hard drive
Intel Skylake Core i3-6300
Kingston HyperX Fury, 8GB, DDR4-2133, CL13
GIGABYTE B150M-D3H(ddr4 version)
and a r7 370 2gb/4gb

Sorry for the long post, I really appreciate your help

 

[Rogue Leader]

4gb of ram is for high res textures, there are games at 1080 that will utilize it. That said you are going to need to turn details down on the games for them to run at a smooth frame rate at 1080 on an R7 370 with a core i3. So in short, 2gb is fine, you won't get to the level that those textures will be used.

 

[TimThePCMasterRace]

Hi, thanks for the reply , but would there be a big dip in performance from 2560x1080 to 1920x1080 on a 2gb card?

 

[jerdle]

Save your 30 bucks or put it elsewhere, its unlikely to impact performance.

 

[Rogue Leader]

Hi, thanks for the reply , but would there be a big dip in performance from 2560x1080 to 1920x1080 on a 2gb card?

Performance at that resolution is affected by the GPU processor speed, not the amount of memory. Performance will be worse at 2560x1080.

TBH to run that resolution you may even have to go to less detail than you would at 1080p. You really should be using faster hardware.