Bottleneck cpu

[Atlant]

how do you know when u are buying which is the highest performance gpu that ur system can run without getting bottlenecked by the cpu (example for a intel core 2duo 3.2ghz which is the best performance gpu that will not get bottlenecked)

[Devon_Pearce]

well general best practices include

1 dedicated core for each video card

higher clock speeds are more important than more cores

quad core is the most youll ever need

[Octavialicious]

It's just general knowledge, experienced users simply know how good a given CPU is and know if it's powerful enough to handle whatever gpu

 

and you can also look at graphs, if your CPU usage is at like 100% and your GPU usage is at like 60% you know it's a bottleneck

[Senzelian]

how do you know when u are buying which is the highest performance gpu that ur system can run without getting bottlenecked by the cpu (example for a intel core 2duo 3.2ghz which is the best performance gpu that will not get bottlenecked)

It is practically impossible to know that.

Each application performs different.

For example my i5-4770 isn't bottlenecking my two 980s as long as I don't play games like Cities:Skylines, when my two 980s don't matter at all.

It depends simply on what you want to do. 

You can read more about it here:

http://www.pcper.com/reviews/Systems/Quad-Core-Gaming-Roundup-How-Much-CPU-Do-You-Really-Need

[Devon_Pearce]

that being said an i3 with a high clock speed will work fine if your only using 1 video card

[niofalpha]

how do you know when u are buying which is the highest performance gpu that ur system can run without getting bottlenecked by the cpu (example for a intel core 2duo 3.2ghz which is the best performance gpu that will not get bottlenecked)

Depends on a variety of factors and what you're doing. The Core 2 Duo could probably atmost handle a 270. But the things that matter the most are

 

-Resolution (Higher Res = lesss CPU bound)

-Architecture (This counts as IPC higher IPC (Usually newer CPU) = better performance)

-Task (GPU heavy tasks dont bottle neck as hard)

-Clock Speed (Doesn't matter much in most cases as long as you have a powerful CPU, but if you have a weak one it can make the bottleneck smaller).

-Thread count (If game's need more than 2 Threads to run, then it won't perform as good.)

[Praesi]

A midrange cpu with 4 cores and 3.2+ Ghz is enough to handle every GPU out there.