Upgrading to GTX 970 not much faster, is this normal?
Posted: Tue Feb 17, 2015 7:55 pm
I mainly restore 12-bit captures of 480i material, so lots of 720x480i 32-bit work with neatvideo. I've used Premiere CS5 with a GTX 470 for years with these kinds of performance times:
720x480i 32-bits radius 1 75% of available GPU RAM: GPU only = 22.7fps, CPU + GPU = 26.3fps
I upgraded the video card to the GTX 970 which over has 3 times the cores and memory bandwidth, but when I test, I see only a tiny improvement:
GPU only = 30.3fps, CPU + GPU = 31.3
Why such a small improvement? Any ideas? This was very disappointing to see after spending nearly $400 on a new video card.
(All CPU+GPU times were done by choosing Optimize and accepting the fastest combination. Also, I know the last 0.5G of the 970's RAM is slower than the rest so I was careful to tell it to use only the first 75% of GPU RAM.)
720x480i 32-bits radius 1 75% of available GPU RAM: GPU only = 22.7fps, CPU + GPU = 26.3fps
I upgraded the video card to the GTX 970 which over has 3 times the cores and memory bandwidth, but when I test, I see only a tiny improvement:
GPU only = 30.3fps, CPU + GPU = 31.3
Why such a small improvement? Any ideas? This was very disappointing to see after spending nearly $400 on a new video card.
(All CPU+GPU times were done by choosing Optimize and accepting the fastest combination. Also, I know the last 0.5G of the 970's RAM is slower than the rest so I was careful to tell it to use only the first 75% of GPU RAM.)