Can overclocking the GPU cause decreased performance? - Techist - Tech Forum

Go Back   Techist - Tech Forum > Computer Hardware > Overclocking and Modding
Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 03-11-2013, 10:41 PM   #1 (permalink)
Ultra Techie
 
Join Date: Dec 2005
Location: NY, USA
Posts: 771
Default Can overclocking the GPU cause decreased performance?

I ask because it seems the more my 660 Ti downclocks, the higher benchmark score I get.

Here's a run at the maximum stable overclock I could get 1280/3206:

P4937 3DMarks

Graphics score was 5794.


And here's the run that downclocked to 705/3206:

P5123 3DMarks

Graphics score was 6036.



I have 2 other "inbetween" clock speed runs that follow the same trend. I don't get it, what gives?
__________________

__________________
  • AMD FX 8350 Black Edition
  • XFX R9 390 8GB
  • 16GB (8x2) GSKILL DDR3 1866mhz
  • GIGABYTE GA-990FXA-UD3 AM3+
  • Aspire X-Plorer Silent Case
  • PC Power & Cooling Silencer 610W Continuous
  • 180GB Intel 520 SSD
  • Vizio 32" TV (1920/1080)/Acer P221W 22" Widescreen LCD (1680/1050)
Twizted_3kgt is offline   Reply With Quote
Old 03-11-2013, 10:53 PM   #2 (permalink)
Build Guru
 
PP Mguire's Avatar
 
Join Date: Dec 2004
Location: Fort Worth, Texas
Posts: 28,322
Default Re: Can overclocking the GPU cause decreased performance?

Could be not enough voltage, overheating causing throttling, or CPU bottleneck.
__________________

__________________
"Resolution is just a number." #Ubisoft
Origin/Steam = PP_Mguire Twitch = pp_mguire Instagram = ppmguire PSN = PP_Mguire

Access to my Plex PM me.
PP Mguire is online now   Reply With Quote
Old 03-12-2013, 12:12 AM   #3 (permalink)
Ultra Techie
 
Join Date: Dec 2005
Location: NY, USA
Posts: 771
Default Re: Can overclocking the GPU cause decreased performance?

Quote:
Originally Posted by PP Mguire View Post
Could be not enough voltage, overheating causing throttling, or CPU bottleneck.
I think the voltage was excessive, 1.175v which is maxed and not even necessary to keep it stable. The temps didn't get above 65C. So that leaves the CPU, which is old and probably the problem. Hadn't thought of that.

Ill have to find a comparison 660ti run on a better CPU.
__________________
  • AMD FX 8350 Black Edition
  • XFX R9 390 8GB
  • 16GB (8x2) GSKILL DDR3 1866mhz
  • GIGABYTE GA-990FXA-UD3 AM3+
  • Aspire X-Plorer Silent Case
  • PC Power & Cooling Silencer 610W Continuous
  • 180GB Intel 520 SSD
  • Vizio 32" TV (1920/1080)/Acer P221W 22" Widescreen LCD (1680/1050)
Twizted_3kgt is offline   Reply With Quote
Old 03-12-2013, 12:18 AM   #4 (permalink)
Build Guru
 
PP Mguire's Avatar
 
Join Date: Dec 2004
Location: Fort Worth, Texas
Posts: 28,322
Default Re: Can overclocking the GPU cause decreased performance?

Another thing is it could not be getting enough power. When I was cranking the clocks on my 580s and the lights started flickering I noticed I was pulling over 1000w from the wall. Meaning I was exceeding overload on this 850w and the higher I clocked the more it crashed and the lower my score was.

Just as a comparison, an i5 750 and GTX 580 both overclocked get 7k. A 660ti is faster than a 580 so your hold back is for sure the CPU in points. In the reducing points it's still one of the things I mentioned.
__________________
"Resolution is just a number." #Ubisoft
Origin/Steam = PP_Mguire Twitch = pp_mguire Instagram = ppmguire PSN = PP_Mguire

Access to my Plex PM me.
PP Mguire is online now   Reply With Quote
Old 03-12-2013, 11:25 AM   #5 (permalink)
Ultra Techie
 
Join Date: Dec 2005
Location: NY, USA
Posts: 771
Default Re: Can overclocking the GPU cause decreased performance?

Quote:
Originally Posted by PP Mguire View Post
Another thing is it could not be getting enough power. When I was cranking the clocks on my 580s and the lights started flickering I noticed I was pulling over 1000w from the wall. Meaning I was exceeding overload on this 850w and the higher I clocked the more it crashed and the lower my score was.

Just as a comparison, an i5 750 and GTX 580 both overclocked get 7k. A 660ti is faster than a 580 so your hold back is for sure the CPU in points. In the reducing points it's still one of the things I mentioned.
Looks like I would need some hardware to measure wattage, what do you use? Kill-a-watt?

I'm sure the CPU is bottlenecking my score. It was when I first got the 560 Ti a year ago, so probably moreso with the 660 Ti. But so far I haven't seen any difference between benchmarked FPS in games versus what I'm getting, which is really my main concern and the reason I haven't upgraded CPU/mobo.

I've just never seen an overclock actually lower a score/fps.
__________________
  • AMD FX 8350 Black Edition
  • XFX R9 390 8GB
  • 16GB (8x2) GSKILL DDR3 1866mhz
  • GIGABYTE GA-990FXA-UD3 AM3+
  • Aspire X-Plorer Silent Case
  • PC Power & Cooling Silencer 610W Continuous
  • 180GB Intel 520 SSD
  • Vizio 32" TV (1920/1080)/Acer P221W 22" Widescreen LCD (1680/1050)
Twizted_3kgt is offline   Reply With Quote
Old 03-12-2013, 11:44 AM   #6 (permalink)
Build Guru
 
PP Mguire's Avatar
 
Join Date: Dec 2004
Location: Fort Worth, Texas
Posts: 28,322
Default Re: Can overclocking the GPU cause decreased performance?

Yea I use a Kill-A-Watt.

Yea you're right there, upgrading the CPU will only make a small difference in games and a huge difference in benchmarks. Not exactly worth it.

That's why I think there's something up. Instead of going down it should only make it slightly go up. Are you sure your load temp is only 65? Have you tested this with something like Furmark?
__________________
"Resolution is just a number." #Ubisoft
Origin/Steam = PP_Mguire Twitch = pp_mguire Instagram = ppmguire PSN = PP_Mguire

Access to my Plex PM me.
PP Mguire is online now   Reply With Quote
Old 03-12-2013, 03:54 PM   #7 (permalink)
Ultra Techie
 
Join Date: Dec 2005
Location: NY, USA
Posts: 771
Default Re: Can overclocking the GPU cause decreased performance?

Quote:
Originally Posted by PP Mguire View Post
Yea I use a Kill-A-Watt.

Yea you're right there, upgrading the CPU will only make a small difference in games and a huge difference in benchmarks. Not exactly worth it.

That's why I think there's something up. Instead of going down it should only make it slightly go up. Are you sure your load temp is only 65? Have you tested this with something like Furmark?
Well I've been using the stress test and GPU burn-in from Kombustor 2.3 to see where the max GPU temp gets to. 65C is the highest I've seen it go since rerouting my wires and eliminating fan controllers (hard wired to 100%). But it takes forever for it to get that high, and that was overclocked as high as it would go with the voltage as high as it would go.

Without the overclock/overvolt it levels off at 61-62C. In BF3 and modded Skyrim it stays around 50C with a max of 60C. Idles at 30C.

I did have a 2-3 max fps increase when overclocked in the stress tests though. So maybe its just 3DMark? Wouldn't really make sense though.

Edit: So I tried Furmark just to be sure on the temps since you mentioned it, same temp 61-62C is where it levels off.

I also did no overclock vs overclock in Furmark, and I gain 1fps overclocked (1254/3206) vs not overclocked. Maybe it is just 3DMark?
__________________
  • AMD FX 8350 Black Edition
  • XFX R9 390 8GB
  • 16GB (8x2) GSKILL DDR3 1866mhz
  • GIGABYTE GA-990FXA-UD3 AM3+
  • Aspire X-Plorer Silent Case
  • PC Power & Cooling Silencer 610W Continuous
  • 180GB Intel 520 SSD
  • Vizio 32" TV (1920/1080)/Acer P221W 22" Widescreen LCD (1680/1050)
Twizted_3kgt is offline   Reply With Quote
Old 03-12-2013, 04:39 PM   #8 (permalink)
Build Guru
 
PP Mguire's Avatar
 
Join Date: Dec 2004
Location: Fort Worth, Texas
Posts: 28,322
Default Re: Can overclocking the GPU cause decreased performance?

Well like I said stability could be an issue. 3dmark will drop score for various reasons so there is really no way to tell. If the overclock isn't stable enough with the supplied voltages it could drop score.

Also, are you raising boost clock or standard clock?
__________________
"Resolution is just a number." #Ubisoft
Origin/Steam = PP_Mguire Twitch = pp_mguire Instagram = ppmguire PSN = PP_Mguire

Access to my Plex PM me.
PP Mguire is online now   Reply With Quote
Old 03-12-2013, 06:07 PM   #9 (permalink)
Ultra Techie
 
Join Date: Dec 2005
Location: NY, USA
Posts: 771
Default Re: Can overclocking the GPU cause decreased performance?

Quote:
Originally Posted by PP Mguire View Post
Well like I said stability could be an issue. 3dmark will drop score for various reasons so there is really no way to tell. If the overclock isn't stable enough with the supplied voltages it could drop score.

Also, are you raising boost clock or standard clock?
Boost clock and then forcing it to run boost clock constant. I don't think it lets me raise standard clock.
__________________
  • AMD FX 8350 Black Edition
  • XFX R9 390 8GB
  • 16GB (8x2) GSKILL DDR3 1866mhz
  • GIGABYTE GA-990FXA-UD3 AM3+
  • Aspire X-Plorer Silent Case
  • PC Power & Cooling Silencer 610W Continuous
  • 180GB Intel 520 SSD
  • Vizio 32" TV (1920/1080)/Acer P221W 22" Widescreen LCD (1680/1050)
Twizted_3kgt is offline   Reply With Quote
Old 03-12-2013, 06:29 PM   #10 (permalink)
Build Guru
 
PP Mguire's Avatar
 
Join Date: Dec 2004
Location: Fort Worth, Texas
Posts: 28,322
Default Re: Can overclocking the GPU cause decreased performance?

That could be it. Boost clock too high could be unstable forcing regular clock speed or lower boost.
__________________

__________________
"Resolution is just a number." #Ubisoft
Origin/Steam = PP_Mguire Twitch = pp_mguire Instagram = ppmguire PSN = PP_Mguire

Access to my Plex PM me.
PP Mguire is online now   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 03:51 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.