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Depends quite a lot on resolution your running anyway.
"Bottleneck" is... a pretty silly term (imo). It vastly oversimplifies the matter.
If you have your graphics set low on a high end card, yes, the CPU will be the limiter.
If you have your graphics set high on a low end card, yes, the GPU will be the limiter.
Im running at 1080p, and I have my settings medium / high..so assuming that my CPU will be the main factor here...
"Bottleneck" is... a pretty silly term (imo). It vastly oversimplifies the matter.
Csgo is definitely CPU limited in most cases, so not the best title for testing.
What framerate are you getting?
Is it the dual core pentium?
If so definitely not enough for a 1070 on a lot of games.