I had no issues are slow down and stuttering when play with mods on the GTX 560 1GB. The AMD CPU did hold me back a bit in some situation though. Skyrim likes Intel CPUs.It takes more than you think on Ultra settings. Your quote just stated that it could use that VRAM in Skyrim and GPU Tweak's graph showed my card staying well above 1GB the entire time. As with any hardware, usage patterns make a difference. I was just giving my example (and I played a lot of Bethesda games, mostly modded). If it doesn't apply to the O.P. he can ignore it. The anecdote about the power supply might be of use in allaying any concern he might have.