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Q6600 with EVGA 680i Overclock help

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September 17, 2011 3:43:13 AM

I'm trying to overclock this old Q6600 B3 with minimal success. The issue appears to be inadequate cooling. Would I see better results with a Thermalright Ultra 120 Extreme and Scythe S-FLEX SFE21F fan instead of the ACF 7 Pro?

System specs:
EVGA 680i 122-CK-NF68-A1
Core 2 Quad Q6600 Kentsfield B2 Stepping
Artic Cooling Freezer 7 Pro CPU fan
4 GB CORSAIR Dominator 1066Mhz CM2X1024-8500C5D
CMXAF1 Ram fan
Two GTX 260 Sonic 216SP in SLI mode
Antec Nine Hundred Black Steel ATX Mid Tower
Antec HGC900 PS
Lite-On IHAS124-04 DVD
Seagate Barracuda 1TB HD

I've upgraded this Bios to P33, and even with a low Vcore of 1.29 my temps are high. From what I was told on this chip:

Quote:
Q6600 B3 Stepping: Tcase Max 62c, B3 Stepping, Tjunction Max 90c

-Tcase/Tjunction-
--60--/--70--70--70--70-- Hot
--55--/--65--65--65--65-- Warm
--50--/--60--60--60--60-- Safe
--25--/--35--35--35--35-- Cool

70C is in the Hot range and is close to exceeding the Tcase Max of 62C.


Core Temp 1.0 temps adjusted +5 for each of the 4 cores in the settings to display the correct temps and match Real Temp, Everest, and Speedfan.

At Idle, Temps are: 40 42 39 38C

Prime 95 Blend Test: 59 60 56 51C


Prime 95 Small FFTs: 72 73 67 64C


If I try and increase the vcore past 1.3v and attempt a higher over clock, temps start to get into the 80's during the Small FFTs stress testing.

What is the rule of thumb for prime 95 testing on this chip? Is it Prime 95 Blend/Small FFTs = 70C/80C or 80C/90C for the Tjunction being reported in the attached pictures for the cores?

Bios settings for the attached pictures:

Vcore Voltage: 1.2875v
CPU FSB: 1.4v
nForce SPP: 1.4v
nForce MCP: 1.5v
HT nForce SPP <-> MCP: 1.35v
vdimm 1.9v

HPET Function - Disabled
Nvidia GPU Ex: Disabled
LinkBoost: Disabled
System Bios Cacheable: Disabled
Cpu spread spectrum: Disabled
PCIe spread spectrum: Disabled
HT spread spectrum: Disabled
Sata spread spectrum: Disabled
Sli-Ready Memory: FSB - Memory Clock Mode: Unlinked

PCIEX16_1 Frequency (Mhz): 100
PCIEX16_2 Frequency (Mhz): 100
PCIEX16_3 Frequency (Mhz): 100
SPP<->MCP Ref Clock, Mhz: 200
nForce SPP --> nForce MCP [5 x]
nForce SPP <-- nForce MCP [5 x]

CPU Multiplier: 9x
x FSB - Memory Ratio: Auto
FSB (QDR), Mhz: 1300
Actual FSB (QDR), Mhz: 1066.7
MEM (DDR), Mhz: 800
Actual MEM (DDR), Mhz: 800

Memory Timing Setting: Expert
tCL (CAS Latency):5
tRCD: 5
tRP: 5
tRAS: 15
Command Per Clock (CMD): 2T

Advance Memory Settings
tRRD: AUTO
tRC: AUTO
tWR: AUTO
tWTR: AUTO
tREF: AUTO

Limit CPUID MaxVal: Disabled
Intel SpeedStep: Disabled
PPM mode: Native Mode
CPU Thermal Control: Disabled
C1E Enhanced Halt State: Disabled
Execute Disable Bit: Disabled
Virtualization Technology: Disabled

CPU Core 0: Enabled
CPU Core 1: Enabled
CPU Core 2: Enabled
CPU Core 3: Enabled

Is the heat sink the limitation? People have reported 3.4-3.6Ghz with this same exact setup on B3 stepping on air.
a c 172 à CPUs
a c 197 K Overclocking
September 18, 2011 9:06:40 AM

prime time said:
I'm trying to overclock this old Q6600 B3 with minimal success. The issue appears to be inadequate cooling. Would I see better results with a Thermalright Ultra 120 Extreme and Scythe S-FLEX SFE21F fan instead of the ACF 7 Pro?

Yes. Speaking from experience (Q6600 G0 :) , EP35-DS3P, ACF7P, and later TRUE/SFLEX Sff21F), yes, you will.

I found that the stock cooler worked fine up to 3.0 GHz. An ACF7P worked OK up to 3.3 GHz. The TRUE got me to 3.6 GHz. Load temps at 3.6 GHz were 61 - 66 C in an Antec 900 case.

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a b à CPUs
a b K Overclocking
September 18, 2011 10:44:04 AM

Jsc, do you think the 212+ will cool the b3 q6600? It does a pretty good job with socket 1366, I believe the tdp is 130w. If so that a pretty cheap solution for him.
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September 18, 2011 4:44:10 PM

Thanks jsc.

I'm going to try both of these fans with the Thermalright Ultra 120 Extreme

Scythe Slip Stream SY1225SL12M
Noctua NF-S12B FLX

I also have a Q6600 G0 stepping sitting here to replace the B3 with.
Plan is to get 3.6Gz on air, quietly.
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September 19, 2011 1:21:18 PM

jsc said:
Yes. Speaking from experience (Q6600 G0 :) , EP35-DS3P, ACF7P, and later TRUE/SFLEX Sff21F), yes, you will.

I found that the stock cooler worked fine up to 3.0 GHz. An ACF7P worked OK up to 3.3 GHz. The TRUE got me to 3.6 GHz. Load temps at 3.6 GHz were 61 - 66 C in an Antec 900 case.


I notice that load temps go even higher at Prime small FFTs than Prime blending. For this G0 chip, should the temp not exceed 70C Tj maxx on small FFTs?
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October 27, 2011 1:47:40 PM

Hi, I have basically the same set up as you

System specs:
EVGA 680i 122-CK-NF68-A1
Core 2 Quad Q6600 Kentsfield G0 stepping
4 GB CORSAIR Dominator 1066Mhz CM2X1024-8500C5D
620watt psu
gtx 295
1tb hdd
With a big case forget the name (digital storm twister extreme??)

I have been attempting to over clock this rig for quite some time now to no avail. everything I put in, during prime (or test via playing a game) the computer locks up for approx 10sec then shuts down. The temps were fine (around 40's) on idle, and max load on prime 60-62 on first 2 core's. I want to say the cpu was at 3.2ghtz to 3.4ghtz. I tried many other variations as well...lots. Hell, I can't even run the memory at spec'd settings (1066mhz) because it crashes...

I've contemplated just buying two new sticks of ram (2gigs each).


The memory has been tested several times my memtest, no errors. I'm not sure what's wrong. If you do get a working over clock, let me know!!
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October 27, 2011 1:56:22 PM

Using the Thermalright ultra 120 Extreme heatsink, I was able to go 3.6ghz stable at a 9x multi with great temps, but the memory was only running at 800mhz. Memtest was fine overnight, and so was prime95. After about a week, the board was throwing out memory error codes, and I had to reset the CMOS. This board is very picky about memory size and running 4 1gb sticks is a PITA. I may do the same as you did with the two sticks at 2gigs each. Make sure you are on the latest P33 bios.
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November 9, 2011 3:33:28 AM

Computer has been running fine for last 2 weeks due to me not shutting it down at 3.0ghz....and when the computer locks up (BF3 most of the time) I push the reset button so the comp doesn't reset the voltages. When the power goes out next time, I'll have to reset everything anyway so I'll bump the Over clock up some on the processor, 3.4 perhaps.


Wish I new why the computer won't start after a hard shutdown(c1 error, unless I take out a stick of ram reset ram voltages from 1.85 then turn off again re-insert stick of ram).
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