Hello community, I've been having trouble getting a stable overclock on my PC and was hoping to get some direction from someone more experienced with system overclocking. This is my first attempt at trying to overclock a system, and after reading up on it quite a bit, I gave it a try. Some of the more successful details of my attempts are below.
My System:
Intel Q9450 2.66 GHz with Cooler Master TPC 812 Heat Sink
EVGA 780i SLI (132-CK-NF78)
8GB DDR2 PC6400 (4 x 2GB – Kingston ValueRAM KVR800D2N5K2)
EVGA GeForce GTX 460 (main video card)
XFX GeForce GTS 250 (for PhysX processing)
First attempt:
Based on “[p]'s 780i Overclocking Guide” (http://www.evga.com/forumsarchive/tm.asp?m=222688). I made many attempts at changing CPU core voltage in order to get a stable system. However, I was unsuccessful, below are the settings that seemed to last the longest under stress testing. I used Prime95 for stress testing and CPUID HW Monitor for temperature measurements.
Goal
QDR: 1666 MHz
DRAM: 800 MHz
Voltages
CPU Core: 1.3750 V
CPU FSB: 1.4 V
Memory: 1.85 V
SPP: 1.4V
MCP: 1.525V
SPP<->MCP: 1.25V
Max Temperature
System: 63 C
CPU (SPP?): 107 C
CPU1 (MCP?): 78 C
Core 1: 51 C
Core 2: 50 C
Core 3: 58 C
Core 4: 52 C
Results
Prime 95 ran for about 2:53:00
Second Attempt:
Also based on “[p]'s 780i Overclocking Guide”. I attempted to lower the FSB QDR to something that appeared to be much more attainable. 400MHz FSB is afterall what the motherboard is rated for by the manufacturer. I made many more attempts at changing CPU core voltage. Below are the settings that seemed to last the longest under stress testing. I used Prime95 for stress testing and CPUID HW Monitor for temperature measurements.
Goal
QDR: 1600 MHz
DRAM: 800 MHz
Voltages
CPU Core: 1.34375 V
CPU FSB: 1.4 V
Memory: 1.85 V
SPP: 1.4V
MCP: 1.525V
SPP<->MCP: 1.25V
Max Temperature
System: 58 C
CPU (SPP?): 107 C
CPU1 (MCP?): 78 C
Core 1: 51 C
Core 2: 50 C
Core 3: 58 C
Core 4: 52 C
Results
Prime 95 ran for about 2:53:00
Third Attempt:
I than found this post which suggested starting with the motherboards “auto” settings for some of the values (http://www.evga.com/forumsarchive/tm.asp?m=499530&mpage=1&key=%F1%B9%BD%8A).
I decided to go back to the drawing board and used Memtest86+ to test two of my 4 memory sticks to make sure they were working properly. Each was tested by individually in the same DIMM slot using the manufacturers recommended settings in the BIOS (5-5-5-18 @ 1.80V). 7 full passes of each showed 0 errors. I then proceeded to stress test the system with stock BIOS settings, and only these two memory sticks. A one hour OCCT stress test, and ~2 hours of Prime95 showed no failures.
I then began trying to overclock my CPU again by slowly increasing the CPU core voltage from 1.20 V and got as high as 1.4250 V. Unfortunately, I was unable to get a stable system for more than 20 or 30 minutes.
Goal
QDR: 1600 MHz
DRAM: 800 MHz
Voltages
CPU Core: 1.4250V
CPU FSB: Auto(1.30 V)
Memory: 1.8 V
SPP: Auto(1.3 V)
MCP: Auto(1.5 V)
SPP<->MCP: Auto(1.2 V)
Results
Prime 95 ran for about 0:20:00
OCCT for about 0:15:00
I didn't want to attempt raising the CPU core voltage any higher than 1.4250 V, and attempting to alter any other voltage value would be more or less a random guess on my part. Instead I thought I would post here in an attempt to get a more guided approach. Can anyone with provide me with some suggestions or a direction for what I should be looking at next?
My System:
Intel Q9450 2.66 GHz with Cooler Master TPC 812 Heat Sink
EVGA 780i SLI (132-CK-NF78)
8GB DDR2 PC6400 (4 x 2GB – Kingston ValueRAM KVR800D2N5K2)
EVGA GeForce GTX 460 (main video card)
XFX GeForce GTS 250 (for PhysX processing)
First attempt:
Based on “[p]'s 780i Overclocking Guide” (http://www.evga.com/forumsarchive/tm.asp?m=222688). I made many attempts at changing CPU core voltage in order to get a stable system. However, I was unsuccessful, below are the settings that seemed to last the longest under stress testing. I used Prime95 for stress testing and CPUID HW Monitor for temperature measurements.
Goal
QDR: 1666 MHz
DRAM: 800 MHz
Voltages
CPU Core: 1.3750 V
CPU FSB: 1.4 V
Memory: 1.85 V
SPP: 1.4V
MCP: 1.525V
SPP<->MCP: 1.25V
Max Temperature
System: 63 C
CPU (SPP?): 107 C
CPU1 (MCP?): 78 C
Core 1: 51 C
Core 2: 50 C
Core 3: 58 C
Core 4: 52 C
Results
Prime 95 ran for about 2:53:00
Second Attempt:
Also based on “[p]'s 780i Overclocking Guide”. I attempted to lower the FSB QDR to something that appeared to be much more attainable. 400MHz FSB is afterall what the motherboard is rated for by the manufacturer. I made many more attempts at changing CPU core voltage. Below are the settings that seemed to last the longest under stress testing. I used Prime95 for stress testing and CPUID HW Monitor for temperature measurements.
Goal
QDR: 1600 MHz
DRAM: 800 MHz
Voltages
CPU Core: 1.34375 V
CPU FSB: 1.4 V
Memory: 1.85 V
SPP: 1.4V
MCP: 1.525V
SPP<->MCP: 1.25V
Max Temperature
System: 58 C
CPU (SPP?): 107 C
CPU1 (MCP?): 78 C
Core 1: 51 C
Core 2: 50 C
Core 3: 58 C
Core 4: 52 C
Results
Prime 95 ran for about 2:53:00
Third Attempt:
I than found this post which suggested starting with the motherboards “auto” settings for some of the values (http://www.evga.com/forumsarchive/tm.asp?m=499530&mpage=1&key=%F1%B9%BD%8A).
I decided to go back to the drawing board and used Memtest86+ to test two of my 4 memory sticks to make sure they were working properly. Each was tested by individually in the same DIMM slot using the manufacturers recommended settings in the BIOS (5-5-5-18 @ 1.80V). 7 full passes of each showed 0 errors. I then proceeded to stress test the system with stock BIOS settings, and only these two memory sticks. A one hour OCCT stress test, and ~2 hours of Prime95 showed no failures.
I then began trying to overclock my CPU again by slowly increasing the CPU core voltage from 1.20 V and got as high as 1.4250 V. Unfortunately, I was unable to get a stable system for more than 20 or 30 minutes.
Goal
QDR: 1600 MHz
DRAM: 800 MHz
Voltages
CPU Core: 1.4250V
CPU FSB: Auto(1.30 V)
Memory: 1.8 V
SPP: Auto(1.3 V)
MCP: Auto(1.5 V)
SPP<->MCP: Auto(1.2 V)
Results
Prime 95 ran for about 0:20:00
OCCT for about 0:15:00
I didn't want to attempt raising the CPU core voltage any higher than 1.4250 V, and attempting to alter any other voltage value would be more or less a random guess on my part. Instead I thought I would post here in an attempt to get a more guided approach. Can anyone with provide me with some suggestions or a direction for what I should be looking at next?