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Phenom II 940 BE - looking to OC on air - read guides, no luck

post #1 of 13
Thread Starter 
Hi OC.net

Lately my PC has been pretty sluggish with modern gaming so I opted for a lower-budget solution for some hopeful performance. I added a 2nd GPU and an aftermarket heatsink with the intention to OC.


Here is my current rig (mid size tower):
-CPU
AMD Phenom II X4 940 Deneb 3.0GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM2+ 125W Quad-Core Black Edition Processor

-HEATSINK
Cooler Master GeminII S524

-MOBO
ASUS M4N72-E AM2+/AM2 NVIDIA nForce 750a SLI ATX AMD Motherboard

-GPU SLI
MSI N560GTX-Ti Twin Frozr II GeForce GTX 560 Ti (Fermi) 1GB 256-bit GDDR5 x 2

-RAM
OCZ Reaper HPC 8GB (4 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory

-PSU
CORSAIR CMPSU-850TX 850W ATX12V 2.2 / EPS12V 2.91 SLI Ready CrossFire Ready Active PFC Power Supply

I have the ability to change nearly everything in the BIOS and have been using Prime95 to test with. The best I've hit so far is 17x CPU multiplier @ 1.5V, FSB = 206, and DRAM Voltage = 2.2 ---- this got me 3.5GHz CPU, DRAM Freq = 412, and NB & HT = 1856.

This passed the Small FFT in Prime95 for 3 hours (no crash, I stopped it) and failed in Blend after 4 hours. So it's definitely not stable.

Looking for thoughts / advice on what my limits are on this rig and what I can push further.

Thank you in advance. This stuff gets confusing after a while.
Edited by zk6760 - 12/6/12 at 10:49pm
post #2 of 13
Test the CPU and memory overclocks seperately so you know which one isnt stable.
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RAMCoolingOSPower
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CoolingKeyboardPowerCase
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Phenom II x4 965 @4.1 [2800 cpu-nb] Asus M5A97 R1 AMD 6950 Kingston HyperX 1600mhz 8-9-8-20-21 
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13 Evolved
(9 items)
 
13
(9 items)
 
Classic
(11 items)
 
CPUMotherboardGraphicsGraphics
AMD FX-8120 Bulldozer 8-core CPU MSI 990FX GD80 v2 ASUS R9-280 Direct CU II ASUS R9-280 Direct CU II 
RAMCoolingOSPower
Kingston 16GB (4 x 4 GB) DDR3-1333 C9 1.5v Phanteks PH-TC14PE Windows 10 Antec True-power Quattro 1200W 
Case
Cooler Master CM Storm Stryker 
CPUMotherboardGraphicsRAM
1045T @4.05Ghz 1.45v [300 FSB] 3000 NB 1.26v MSI 990FXA-GD80 v2 EVGA GTX480 @820mhz Crucial Ballistix sport VLP 2x4GB @ 1333 cas 7 
CoolingKeyboardPowerCase
Thermaltake Water 2.0 Performer Logitech G710+ OCZ ZT650w CM Storm Stryker 
Mouse
CM Storm Xornet 
CPUMotherboardGraphicsRAM
Phenom II x4 965 @4.1 [2800 cpu-nb] Asus M5A97 R1 AMD 6950 Kingston HyperX 1600mhz 8-9-8-20-21 
Hard DriveCoolingOSMonitor
Too many Thermaltake Water 2.0 Performer Win7 Extreme Edition R1 64bit Acer P224W 22" 1050p 
PowerCaseMouse
Antec BP550 plus Corsair 200R CM Storm Xornet 
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post #3 of 13
Quote:
Originally Posted by zk6760 View Post

Hi OC.net
Lately my PC has been pretty sluggish with modern gaming so I opted for a lower-budget solution for some hopeful performance. I added a 2nd GPU and an aftermarket heatsink with the intention to OC.
Here is my current rig (mid size tower):
-CPU
AMD Phenom II X4 940 Deneb 3.0GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM2+ 125W Quad-Core Black Edition Processor
-HEATSINK
Cooler Master GeminII S524
-MOBO
ASUS M4N72-E AM2+/AM2 NVIDIA nForce 750a SLI ATX AMD Motherboard
-GPU SLI
MSI N560GTX-Ti Twin Frozr II GeForce GTX 560 Ti (Fermi) 1GB 256-bit GDDR5 x 2
-RAM
OCZ Reaper HPC 8GB (4 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory
-PSU
CORSAIR CMPSU-850TX 850W ATX12V 2.2 / EPS12V 2.91 SLI Ready CrossFire Ready Active PFC Power Supply
I have the ability to change nearly everything in the BIOS and have been using Prime95 to test with. The best I've hit so far is 17x CPU multiplier @ 1.5V, FSB = 206, and DRAM Voltage = 2.2 ---- this got me 3.5GHz CPU, DRAM Freq = 412, and NB & HT = 1856.
This passed the Small FFT in Prime95 for 3 hours (no crash, I stopped it) and failed in Blend after 4 hours. So it's definitely not stable.
Looking for thoughts / advice on what my limits are on this rig and what I can push further.
Thank you in advance. This stuff gets confusing after a while.
Think your ram might be getting in the way. A new mobo with DRR3 ram support would have been far better.
Edited by jason387 - 12/6/12 at 11:33pm
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Jay
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FX 8350 4.4Ghz at 1.36v GA 78LMT USB3 Rev 5.0 Sapphire R9 285 OC 16GB Kingston Savage Ram 
Hard DriveHard DriveCoolingOS
1TB Western Digital 500GB Seagate Barracuda Noctua NH-D15S Windows 8.1 
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post #4 of 13
Thread Starter 
This is an old build that I was trying to put some life back into. I built it when the 940 was fresh out - so 4-5 years ago?

Can I put an AM2+ into an AM3 socket, because I'm not seeing AM2+ DDR3 2xPCI-e mobos.
post #5 of 13
No. Sorry my bad. Your best option is to keep the ram at relatively lower clocks to increase chip overclocks. You can't have DRR3 memory with AM2+. The 945 above the 940 does have am3+ support and is also backward compatible!
Here are a few reviews. Think you've got a good OC.
http://www.overclockersclub.com/reviews/phenomii940/4.htm
http://www.techspot.com/review/142-phenom2-overclocking/page2.html
Edited by jason387 - 12/7/12 at 12:21am
Jay
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Jay
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FX 8350 4.4Ghz at 1.36v GA 78LMT USB3 Rev 5.0 Sapphire R9 285 OC 16GB Kingston Savage Ram 
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1TB Western Digital 500GB Seagate Barracuda Noctua NH-D15S Windows 8.1 
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post #6 of 13
Got my 940 at 3.6Ghz stable with good temps 1.45volts you can get it higher but i don't like how hot it gets, ram is DDR2 800mhz 5-5-5=15 I will post my CPU multiplier and FSB when i get home its a ram issue probably as when i had my ram at 2.2v and 4-4-4=12 timings (which it says it capable of doing) i couldn't get a stable overclock.

And Prime will always run your CPU harder than games so don't worry to much about prime 95 run the games your playing try BF3 for a couple of hours if you don't crash your good.
Edited by xXUNLUCKYXx - 12/7/12 at 6:33am
post #7 of 13
Thread Starter 
Couple questions:

1 - CPU Multi = 17.5x and vCore = 1.45V; the Small FFT only runs 2 hours until crash - temps stay well below 60C - is that normal? Seems like a lot of people can be stable with these settings (everything else is default for now)

2 - My default ram voltage is "2.1-2.2v" - can this go higher or should I set it to 2.2v?

3 - My default ram timings are 5-5-5-18 but they are AUTO set to 5-5-5-15
should I adjust them down to 5-5-5-18 manually?

Thanks!

Also - to confirm -- Small FFT = CPU; Large FFT = RAM; Blend = both?
post #8 of 13
Im just wondering if you arent getting the higher clock speed due to the ram running at 1066mhz maybe try lowering it to 800mhz and copy the below settings.

Disable Cool and Quite
CPU Multiplier 18x
CPU Frequency to 200
Voltage 1.4750
Memory is at 1.8v
800mhz
5-5-5=15

Give it a bash see how it performs there is next to no difference running 800mhz compared to 1066mhz.
post #9 of 13
My 940 was starting to degrade a lot after 3 years of abuse. It is probably just tired. I was able to get 3.7 stable, then after a while, I had to lower the clock and memory speeds. I ended up at 3.3 and just a hair under 1000Mhz for the ram. It is probably just a tired chip. I don't think the 940 was the best chip for long term reliability. Just my .02 from my experience.
post #10 of 13
Quote:
Originally Posted by zk6760 View Post

NB & HT = 1856.
L3 cache (in Phenom CPU) is dependent to NB/HT Link. So if HT/NB is higher - Phenom is faster. Default is 2000, safe is 2100-2200.
Quote:
Originally Posted by zk6760 View Post

2 - My default ram voltage is "2.1-2.2v" - can this go higher or should I set it to 2.2v?
3 - My default ram timings are 5-5-5-18 but they are AUTO set to 5-5-5-15
should I adjust them down to 5-5-5-18 manually?

Your default ram voltage and timings are 2.2V and 5-5-5 but with 533 frequency (check memory SPD). Because your actual ram frequency is 412 so 5-5-5 timings should be work even at standard DDR2 voltage 1.8V.
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