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GPU RAM vs System RAM

post #1 of 3
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Let's say I'm running Photoshop with some huge PSD files on a brand new iMac 27". It has 32GB of System RAM and a GTX780m with 4GB of DDR5 RAM. Will Photoshop always use the GPU RAM first because it's faster than the system RAM? If I were to get the GTX 775m iMac 27" model with only 2GB of DDR5 of GPU RAM will there be any slowdown if Photoshop when it starts using the system RAM sooner? (And yes, 32GB helps with the i7 for virtualization and many many Photoshop files running at the same time).

Thanks,
Edited by revlimiter - 3/1/14 at 2:58pm
    
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i7 7700k ASRock - Fatal1ty Z270 Gaming-ITX/ac Mini ITX L... MSI - GeForce GTX 1080 Ti 11GB GAMING X Video Card Corsair - Vengeance LPX 16GB (2 x 8GB) DDR4-320... 
Hard DriveHard DriveCoolingCooling
Crucial - MX300 525GB 2.5" Solid State Drive Toshiba America Electronic Components Inc X300 ... CRYORIG - C7 40.5 CFM CPU Cooler Thermal Grizzly - Kryonaut 1g 1g Thermal Paste 
OSKeyboardPowerCase
Microsoft - Windows 10 Home OEM 64-bit iClever Ultra Slim 3 Color Backlight Aluminum A... Corsair - SF 600W 80+ Gold Certified Fully-Modu... Silverstone - RVZ01B Mini ITX Desktop Case 
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post #2 of 3
Contact the Photoshop people (tech support) see what they have to say.
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Intel i5 7600k Asus M5A99FX Pro 2.0 AMD 470 8GB 16GB DDR3  
Hard DriveOptical DriveCoolingOS
Samsung EVO 500GB Lite-On Blu-ray Burner 4 case fans Win 7 Pro 64-bit 
MonitorKeyboardPowerCase
Yamakasi DS270 SE 27"  Logitech G110 Cooler master 700 Watt Cooler Master 690 II 
MouseMouse PadAudio
Logitech G500 My desk Audio-GD NFB-15.32 
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post #3 of 3
Quote:
Originally Posted by Tacoboy View Post

Contact the Photoshop people (tech support) see what they have to say.
What he said. According to this thread http://forums.adobe.com/thread/1128619 vram seems to only matter for 3d rendering and filters. Things might have changed since that reply. It's unlikely, but still. Only Adobe can give you a definitive answer. Alternatively, you can use GPUZ or Afterburner to monitor your vram usage with such a large image loaded in Photoshop.
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