ziomuschio
take a look...is true???  
 
the Nvidia GTX 970 series video cards have misleading advertising. They claim the cards are 4GB, but of that 4GB only 3.5 is usable in gaming, the remaining 0.5GB is a segmentation reserve for programs that do not require as much memory.

But running games at high resolution that are wanting to use the advertised 4GB of vram seem to be causing stuttering issues with erratic framerate 

In this test I show how the vram bus communication it trying to call both segments which seem to be the cause of the bad FPS in tests and games.

when the card is using 3.5 to 4GB of vram the performance is worse than when the card is using 3.5

https://www.youtube.com/watch?v=wgRir5JwKyU
 
boris said:  Update regarding "GTX 970 memory bug". Wrote another test to check how that slow 0.5 gb memory works and again it's the same thing which driver do for a long time, that memory is stored in RAM instead of VRAM, that's why it slow. Basically, this is standart behavior for the most videocards on the market (vram is physical vram + a bit ram). What it means on practice compared to another videocards? GTX 970 have 3.5 Gb of VRAM. What i see in articles with explanation from NVidia is half-lie and of course casual people are incompenent and better to not listen to them. I don't think it's something horrible to loose 0.5 gb, but it's bad that NVidia hide such information (my own videocard with 2 gb or vram have access to 2.5 gb and nobody annonced it as 2.0 fast and 0.5 slow). So sad that all my posts on the forums were trolled, fools are always the most active and agressive, hopefully it's their own butthurt as they won't listen to professionals.

http://www.pcper.com/reviews/Graphics-Cards/Frame-Rating-Looking-GTX-970-Memory-Performance/COD-Advanced-Warfare-and-Clos
https://forums.geforce.co...-3-5gb-vram-issue/269/


but; more important...if this gonna be confirmed...woul say that the write 4gb on my evga box is not true!?  this is **** illegal. if this be true  evga could denounce nvidia???

ty_ger07
still 4 times faster than system memory.

MrImSoGood

banzaigtv

But look at what you had to do to use that much and look at your framerate

The 970 is 4GB on paper and theory but in reality it's essentially a 3.5GB card

banzaigtv

MrImSoGood

banzaigtv

But look at what you had to do to use that much and look at your framerate

The 970 is 4GB on paper and theory but in reality it's essentially a 3.5GB card

But you will see that the GPU usage is maxed out. And a single GTX 970 certainly cannot handle this game on those settings in 4K resolution at anything over 30 fps. And I can run Titanfall on ultra at a steady 60 fps in 1080p and that game drives my VRAM usage up to 3.6 GB. DA: Inquisition is a very GPU-demanding game. And all of that running on the 344.80 WHQL drivers.