i upgraded mine to a gtx660 it came with a gt120 512mb vram (thats super slow by today's gpus) the ATI card it had before the GT120 melted and was replaced by apple under a GPU recall (there's a burn mark in the macpro from it
😛)
one thing i need to ask is what do you want to do with a mac pro ?
do notice the mac min scores on geek bench are higher than the macpro 3.1 for single core by about 2x and multi core is not to far of (and for most apps far faster as vary few apps can use the 8 cpu cores)
https://browser.primatelabs.com/mac-benchmarks
the macmin also is tiny uses less power is much cooler takes up less room and you can just stick it under the display
😀 super nice. and there fairly cheep new.
im using a macpro because 3 years ago i got the 3.1 cheep and needed something cheep and faster than my laptop and i got the 5.1 because i needed something cheep and faster + im able to use the drives + gpu from my 3.1 in the 5.1.
as time goes buy there getting older and slower so do be clear on what you want from it and how much it will cost to upgrade etc...
edit it's not strange that youtube video play bad once you use macs for a while you notice most things are slower on mac
😛 like games,flash etc
the best gpu is as simple as look at gpu google etc... all the original ones are SLOW if your lucky you will find one user upgraded.
the gt120 was ok but i replaced it in under a week of getting the 3.1 with a gtx660