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h2oStudios
10-29-2006, 05:04 PM
What's the exact affect of RAM on Open GL?

h2o

hrgiger
10-29-2006, 06:30 PM
To the best of my knowledge, memory has little or nothing to do with your OpenGl Display..

Red_Oddity
10-30-2006, 02:24 AM
It does have enormous effect on render times though.

Example (taken from an actual render log from our farm this weekend):
P4 (3Ghz) with 2GB PC3200 Dimms (400Mhz) : render time frame 13 : 2h 15m
P4 (3Ghz) with 2GB PC4200 Dimms (533Mhz) : render time frame 14 : 1h 44m

BeeVee
10-30-2006, 03:02 AM
The amount of RAM on your graphics card makes a difference for the speed of OpenGL based on the amount of swapping it has to do for image maps. If you have enough, then there's none and your OpenGL performance will be as good as it can be. If you don't have enough, then image maps will get copied to and fro between main memory and your card's memory, needing to be mip-mapped every time.

B

h2oStudios
10-30-2006, 08:17 AM
thanks for the feedback,

@BeeVee - there are no image maps involved in my current project, and the machine I;m using is a laptop so upgrading the graphics card is near impossible as to my knowledge, though i could be wrong.

@Red_Oddity - Render time is least of my concern at this point but it's good to know how significant RAM helps rendering.

@hrgiger - Well, if this is the case then upgrading from 768mb to 1 gb would be pointless.

I;m looking to boost layout Open GL performance as much as possible. If its strictly a graphics card issue then I guess i just need a new machine with better hardware.

h2o

Lew
10-30-2006, 11:07 AM
It does have enormous effect on render times though.

Example (taken from an actual render log from our farm this weekend):
P4 (3Ghz) with 2GB PC3200 Dimms (400Mhz) : render time frame 13 : 2h 15m
P4 (3Ghz) with 2GB PC4200 Dimms (533Mhz) : render time frame 14 : 1h 44m

The question was amount of memory, this example seems more a function of buss speed. Am I missing something?

Lew

Red_Oddity
10-31-2006, 04:42 AM
The question was amount of memory, this example seems more a function of buss speed. Am I missing something?

Lew
Nope, your not missing something, just me not reading posts properly, i just gave an example of where more or in this case faster memory would have advantages, but i guess we where taliing about video RAM.

h2oStudios
10-31-2006, 11:26 AM
No, we were talking about standard memory RAM, but from whats been said is RAM has no real significant affect on Open GL Performance ( sans image maps ) and video RAM is the key for speeding up Open GL. I guess I just need a better machine.

h2o