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will it be a big performance dip because he is getting a new cpu and mobo when he has enough money (Likely december).

I said slightly. Like 5% less than the 8350, which nothing has bottlenecked so far. 

I budget build well. Want to learn? PM me if you want advice. 

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780Ti and a AMD chip :L ouch , need to get one of them i7's bro :P 

Current Build : 

 
CASE: Fractal Design R4 w/Window CPU: Intel 4930K,  RAM: 16GB Ripjaws Z 2133Mhz  Cooling: H100i  MotherBoard: Asus P9x79 Pro , PSU: CS750M   Storage: 2x Samsung 840 Pro 256Gb , 1Tb Seagate Barracuda, 500GB WD Black,  Graphics: Gigabyte GTX 780 Windforce 3GB,  Monitors: AOC G2460PG ( G sync monitor), Edge10 24" 1080p , 24" 1680*1020p monitor ( LCD)  Microphone: Blue Yeti  Keyboard: Cougar 700k  Phone: Samsung Note 3  Headphones: Sennheiser HD598

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will my friends fx 8120 bottleneck the 780ti he's getting in a week?

 

It won't as much. If I recall FX chips still only use PCIe 2.0 so that also cause a slight bottle neck. The bottle will be very low though it wont even matter. FX chips are built to last :) 

 

Why not get a 290 or 290x? Vastly cheaper and correct me if I'm wrong but your friend probably isn't using a 120Hz monitor where he needs the extra fps.

ZerueLX11

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pcie2.0 wont bottleneck any high end gpu's, the bandwith on pcie2.0 wont get saturated even by the fastest gpus.

the fx-8120 will be a bottleneck in some old tech badly optimised games that use only a couple cores to process all the data...but most modern games are gpu bound and use many cores on the cpu so in all those he wont notice any bottlenecks...does he run that chip at stock or does he have some overclock? if stock, overclocking the crap out of that beast would be a good idea...

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It won't as much. If I recall FX chips still only use PCIe 2.0 so that also cause a slight bottle neck. The bottle will be very low though it wont even matter. FX chips are built to last :)

 

Why not get a 290 or 290x? Vastly cheaper and correct me if I'm wrong but your friend probably isn't using a 120Hz monitor where he needs the extra fps.

He's already got the 780ti from his friend who sold it to him new for $600. 

PLEASE USE PCPARTPICKER.  My rig: http://pcpartpicker.com/p/ZBmWjX

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pcie2.0 wont bottleneck any high end gpu's, the bandwith on pcie2.0 wont get saturated even by the fastest gpus.

the fx-8120 will be a bottleneck in some old tech badly optimised games that use only a couple cores to process all the data...but most modern games are gpu bound and use many cores on the cpu so in all those he wont notice any bottlenecks...does he run that chip at stock or does he have some overclock? if stock, overclocking the crap out of that beast would be a good idea...

Its still at stock. He won't OC (for some reason).

PLEASE USE PCPARTPICKER.  My rig: http://pcpartpicker.com/p/ZBmWjX

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this is just dum.

not reall look at the benchmarks, when it comes to high end GPU's AMD chips fall behind the pack compared to intel based cpu's so getting s i7 or a really high end i5 should be a must or at least highly recommended 

Current Build : 

 
CASE: Fractal Design R4 w/Window CPU: Intel 4930K,  RAM: 16GB Ripjaws Z 2133Mhz  Cooling: H100i  MotherBoard: Asus P9x79 Pro , PSU: CS750M   Storage: 2x Samsung 840 Pro 256Gb , 1Tb Seagate Barracuda, 500GB WD Black,  Graphics: Gigabyte GTX 780 Windforce 3GB,  Monitors: AOC G2460PG ( G sync monitor), Edge10 24" 1080p , 24" 1680*1020p monitor ( LCD)  Microphone: Blue Yeti  Keyboard: Cougar 700k  Phone: Samsung Note 3  Headphones: Sennheiser HD598

Laptop:

 CPU: 
4710MQ  Ram: 8GB 1600MHz Storage:120Gb 840 Evo + 1Tb 5400Rpm HDD  Graphics: GTX 850M 2GB   Screen: 1080p IPS  
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will my friends fx 8120 bottleneck the 780ti he's getting in a week?

http://www.techspot.com/review/734-battlefield-4-benchmarks/page6.html

no

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Gigabyte GTX460, Gigabyte gt430,
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not reall look at the benchmarks, when it comes to high end GPU's AMD chips fall behind the pack compared to intel based cpu's so getting s i7 or a really high end i5 should be a must or at least highly recommended 

Look at GAME benchmarks, look at the settings used in them, and look all those possible variants, and see for yourself that the performance of, something like a FX 6300 is only 5-6 fps compared to a 4770k, and in some GPU bound games it can be as little as 2-3 frames.

A Synthetic benchmark shows all the possible calculations your system can do at the same time, where a hyperthreaded i7 can beat the crap out of everything.

However in games multiple cores and hyperthreading still needs to catch up, ALOT. Recommending an i7 to someone that will only be gaming is as I´ve stated before, just dum. On 95% of the games the difference between an i5 and i7 is 1-2 frames.

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