Yes, a RAM bottleneck can affect a GPU's performance.
Yes, a RAM bottleneck can affect a GPU's performance.
I own 7 GB of RAM from three different manufacturers. I have a GTX 750 Ti and an i5 4670K.
Technically, using most of it on unrelated functions might slow things down, but this isn't usual.
This idea is false. I've observed users running 6GB HD 7970 graphics on machines with just 4GB of memory.
It won't work, so I suggest swapping the 1GB stick for a 2GB one. This would let your RAM use dual channel properly—only half would be active at 10.6GB/sec instead of both at 21.2GB/sec. Upgrading RAM speed is especially important in newer games when the CPU becomes the bottleneck.