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Just picked up a GTX 780 and I am wondering about cpu bottle neck

post #1 of 14
Thread Starter 
My rig is in the signature, but I am wondering if it is possible thatthe i5-2500k (@4.ghz) could possibly bottleneck with the gtx780. I noticed benchmarks for Crysis 3 were much better than what I was getting with it. I guess the cpu is over 2 years old now, but I really don't want to upgrade that as well.

Also random question, but would my PSU handle 780 in sli (assuming my CPU can).
post #2 of 14
Not sure about your PSU not really my area of expertise but an i5-2500K won't bottleneck a 780, so no need to worry smile.gif
Current build
(17 items)
 
  
CPUMotherboardGraphicsRAM
i5 3570k AsRock Z77 Extreme4 MSI R9 290 8Gb Corsair DDR3 
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500Gb WD  1Tb WD Kingston SSD Windows 7 64 Bit 
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23" 1080p LG IPS 23" 1080p LG IPS 21.5" 1080p Samsung LED Corsair k70 MX Red 
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700W CoolMaster +80 Corsair Graphite 230t Logitech G402 Hyperion Fury Razor Goliath 
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ASUS Xonar DG 
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Current build
(17 items)
 
  
CPUMotherboardGraphicsRAM
i5 3570k AsRock Z77 Extreme4 MSI R9 290 8Gb Corsair DDR3 
Hard DriveHard DriveHard DriveOS
500Gb WD  1Tb WD Kingston SSD Windows 7 64 Bit 
MonitorMonitorMonitorKeyboard
23" 1080p LG IPS 23" 1080p LG IPS 21.5" 1080p Samsung LED Corsair k70 MX Red 
PowerCaseMouseMouse Pad
700W CoolMaster +80 Corsair Graphite 230t Logitech G402 Hyperion Fury Razor Goliath 
Audio
ASUS Xonar DG 
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post #3 of 14
Your cpu is fine at it's overclock for a GTX 780. For two 780s, overclock it to around 4.6GHz.

Your psu is more than enough for a 2500k and two 780s with high overclocks.
    
CPUMotherboardGraphicsRAM
Xeon E5-1680 V2  R4BE  TITAN X (Pascal)   2666 Dominator Platinum CL10 
Hard DriveCoolingCoolingOS
750 NVMe 1.2TB EK HF/rx360/rx120 EK FC/GTs/mcp655 Windows 10 Pro  
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BL3200PT 1600 T2 800d Pro Audio 2.1 + DragonFly Red 
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CPUMotherboardGraphicsRAM
Xeon E5-1680 V2  R4BE  TITAN X (Pascal)   2666 Dominator Platinum CL10 
Hard DriveCoolingCoolingOS
750 NVMe 1.2TB EK HF/rx360/rx120 EK FC/GTs/mcp655 Windows 10 Pro  
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BL3200PT 1600 T2 800d Pro Audio 2.1 + DragonFly Red 
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post #4 of 14
Thread Starter 
hey thanks guys. I needed that clarification. All other games run really good. I guess Crysis 3 is just a beast!
post #5 of 14
Quick questions. How you know when you have a bottleneck? When it's not running as well as it's suppose to? How do figure how much on an overclock you need? I'm just wondering.
post #6 of 14
You know that you have a CPU bottleneck when your CPU utilization is 100% and your GPUs usage is middle/low. For instance, I had a bottleneck when I ran an E6600 clocked at 3.6GHz with a 550Ti. When I played Battlefield 3, my CPU usage was 97-100% while GPU usage was only 40-50%.

Basically if your CPU runs out of resources before your GPU, you KNOW you have a bottleneck.
GameRig3
(14 items)
 
  
CPUMotherboardGraphicsRAM
i7 4770K ASUS Z87-Plus EVGA GTX 770 8GB Corsair Vengeance 
Hard DriveOptical DriveCoolingOS
Western Digital Green None Corsair H110 (with four 140mm fans for push/pull) Windows 8 Pro 64-bit 
MonitorKeyboardPowerCase
Vizio 32 inch TV Apple Pro Keyboard Corsair Gaming Series 700W NZXT 630 Phantom 
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Razer DeathAdder 2013 Generic 
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GameRig3
(14 items)
 
  
CPUMotherboardGraphicsRAM
i7 4770K ASUS Z87-Plus EVGA GTX 770 8GB Corsair Vengeance 
Hard DriveOptical DriveCoolingOS
Western Digital Green None Corsair H110 (with four 140mm fans for push/pull) Windows 8 Pro 64-bit 
MonitorKeyboardPowerCase
Vizio 32 inch TV Apple Pro Keyboard Corsair Gaming Series 700W NZXT 630 Phantom 
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Razer DeathAdder 2013 Generic 
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post #7 of 14
Quote:
Originally Posted by lolzcat View Post

You know that you have a CPU bottleneck when your CPU utilization is 100% and your GPUs usage is middle/low. For instance, I had a bottleneck when I ran an E6600 clocked at 3.6GHz with a 550Ti. When I played Battlefield 3, my CPU usage was 97-100% while GPU usage was only 40-50%.

Basically if your CPU runs out of resources before your GPU, you KNOW you have a bottleneck.

Awesome man, I've been wondering about that. Now it's not the same case when you run game CPU heavy versus one that are GPU intensive right? As well how do you know, you have some sort of program that displays both usage?
post #8 of 14
I use HWinfo64 with an On-Screen Display Server. When I play games, I can see my CPU utilization, CPU temps, GPU utilization, GPU temps, and RAM usage. I could monitor many more things than that with HWinfo64, but those are the only ones I'm interested in or care about.

Here's what it looks like (pulled this image from the Internet). You can set what corner of the scren you want the monitor on, as well as the color of the characters.
Edited by lolzcat - 6/7/13 at 2:48am
GameRig3
(14 items)
 
  
CPUMotherboardGraphicsRAM
i7 4770K ASUS Z87-Plus EVGA GTX 770 8GB Corsair Vengeance 
Hard DriveOptical DriveCoolingOS
Western Digital Green None Corsair H110 (with four 140mm fans for push/pull) Windows 8 Pro 64-bit 
MonitorKeyboardPowerCase
Vizio 32 inch TV Apple Pro Keyboard Corsair Gaming Series 700W NZXT 630 Phantom 
MouseMouse Pad
Razer DeathAdder 2013 Generic 
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GameRig3
(14 items)
 
  
CPUMotherboardGraphicsRAM
i7 4770K ASUS Z87-Plus EVGA GTX 770 8GB Corsair Vengeance 
Hard DriveOptical DriveCoolingOS
Western Digital Green None Corsair H110 (with four 140mm fans for push/pull) Windows 8 Pro 64-bit 
MonitorKeyboardPowerCase
Vizio 32 inch TV Apple Pro Keyboard Corsair Gaming Series 700W NZXT 630 Phantom 
MouseMouse Pad
Razer DeathAdder 2013 Generic 
  hide details  
Reply
post #9 of 14
Quote:
Originally Posted by lolzcat View Post

I use HWinfo64 with an On-Screen Display Server. When I play games, I can see my CPU utilization, CPU temps, GPU utilization, GPU temps, and RAM usage. I could monitor many more things than that with HWinfo64, but those are the only ones I'm interested in or care about.

Here's what it looks like (pulled this image from the Internet). You can set what corner of the scren you want the monitor on, as well as the color of the characters.

Ooo thas fancy, I only have the a default one with my keyboard, only displays cpu and ram, I may have to try this out.thumb.gif
post #10 of 14
This is a common problem with Crysis 3.. there are areas using low gpu power / cpu power / vram.. and theese three values
are switching fast and multicasual + at some spots the game is coded badly.. so no worries for you!

GL!
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