GTX 970 whats the story

janmclare

Hi guys,

So i've decided to get a newer graphics card to have slightly better VRAM capacity till pascal is released.

Now the GTX 970 looks a good deal but I can't seem to figure out what will happen in Iray renders when the 3.5gig limit for fast

VRAM access i used up.

Will the performance of the card drop drastically or it does speed of VRAM does not matter that much for IRAY?

If the performance does drop off will it still be faster than CPU IRAY renders?

I've looked everywhere but can't seem to find a consistant answer especially with regards to IRAY.

 

thanks

 

mjc1016

Nothing...a 970 has 4 GB of memory.  Speed of the memory isn't that important.  Where the split matters is for thngs that are changing multiple times a second, not things that are roughly static for seconds/minutes at a time.

StratDragon

mjc1016 said:

Nothing...a 970 has 4 GB of memory.  Speed of the memory isn't that important.  Where the split matters is for thngs that are changing multiple times a second, not things that are roughly static for seconds/minutes at a time.

some reposts state that when the 970 hits the 3GB thershold it can "stutter"

http://www.extremetech.com/extreme/198214-198214

https://forums.geforce.com/default/topic/803518/geforce-900-series/gtx-970-3-5gb-vram-issue/

nicstt

The 970 and lower cant directly access all 4GB, but they can access it all inderectly, so not an issue for rendering.

mjc1016

StratDragon said:

mjc1016 said:

Nothing...a 970 has 4 GB of memory.  Speed of the memory isn't that important.  Where the split matters is for thngs that are changing multiple times a second, not things that are roughly static for seconds/minutes at a time.

some reposts state that when the 970 hits the 3GB thershold it can "stutter"

http://www.extremetech.com/extreme/198214-198214

https://forums.geforce.com/default/topic/803518/geforce-900-series/gtx-970-3-5gb-vram-issue/

Gaming...for rendering it doesn't matter.  If it 'stutters' for a fraction of a second (somewhere around a 1/30 of a second) during a 5 minute render would anyone really notice?

Most other things will either be in it's memory long enough to not matter or are being buffered...