Question can I upgrade an ATI Radeon 5870 tu 2GB memory?

[Eddy Ottoz]

I want upgrade a Mac Pro 4.1 early 2009

 

[13thmonkey]

no, GPU memory is soldered to the GPU

 

[Metal Messiah.]

Are you asking whether to increase the current GPU VRAM to 2GB Memory, or some other thing ?...NOPE, it's not possible to add more VRAM. It is hardware agnostic.