When they say bottleneck graphics card, it's basically saying like it is what's keeping your computer from being better. Some people could say your power supply is too low of a power, thus making it so you can't run a better processor, mobo, video card. Or you have great psu, mobo, cpu and your graphics card is so old that it is keeping you from the performance you want. Basically bottleneck means something isn't that good and should probably be upgraded.
It's more of a which product is holding another product back. I'll use my computer as an example: I currently have an Athlon X2 3800+ running at 2.6 GHz with an 8800 GTS video card. I run most of my games at 1400 x 900 with all settings set to max. However, my processor is holding me back to get the maximum frame rates from my 8800 GTS video card has to offer. If I put my 8800 GTS in a Core 2 Duo E6700, it's able to get more frame rates at the same resolution setting of 1400 x 900. Summary running Half-Life 2 @ 1400 x 900 /w 4x AA and 16x AF: 1. Athlon X2 3800+ @ 2.6 GHz + 8800 GTS = 140 fps (avg) 2. Core 2 Duo E6700 @ 2.67 GHz + 8800 GTS = 180 fps (avg) ==> This case the Athlon X2 3800+ is bottlenecking the 8800 GTS Bottlenecking doesn't involve with power supplies. You can not achieve higher performance with power supplies, but you can achieve more stability to your system with higher quality power supplies.
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