Sign in with
Sign up | Sign in
Your question
Solved

AMD PHENOM II X4 840 OC, First OC

Last response: in Overclocking
Share
December 1, 2011 7:42:24 PM

Hello,
I had attempted to use the auto OC on my MB and it turned out to be bad. I reset all setting in my BIOS and now I come to you all for advice on how to OC my system.

Specs:

MB- ASUS M4A87TD EVO, AMD 870/DDR3

CPU- AMD PHENOM ii X4 840 (3.2G)

CPU COOLER- CORSAIR 120MM LIQUID COOLER

MEMORY- ADATA 2G x 4 DDR3-1600

GRAPHICS- RADEON HIS 6870 1GB TURBO

POWER SUPPLY- COONIX 700W

CASE- COOLERMASTER HAF 922 MINI CASE

OS- WINDOWS 7 64Bit

STORAGE- HITACHI 1TB 16MB SATA-2

CORE TEMP HAS MY SYSTEM AT:
3211MHz
1.3500V
10-13 Degrees C

The auto OC on the board had it at ~3700MHz but it took like 10 restarts to get the computer to come back up.

More about : amd phenom 840

December 1, 2011 7:58:28 PM

I downloaded CPU-Z and here is the link to what it shows.

m
0
l
December 2, 2011 6:02:28 PM

By using AMD OverDrive I was able to get up to 3596 MHz by bumping the HT ref. Clock to 224 x 16 @ 16 degrees C

If I go to 229 my system freezes.

In the BIOS it seems I cant really change any settings and with AMD OverDrive my CPU VID maxes out at the standard 1.35

Is there anything I can do to get more out of this processor?

Also if I turn on the AMD Core Unlocker my temps jump way up to the 70s....but im not sure if I see a change in performance.
m
0
l
Related resources
a b K Overclocking
December 3, 2011 1:11:56 AM

DISABLE YOUR CORE UNLOCKER ASAP.....Stop using AMD OD to OC as it is full of bugs that could mess your whole system up...use BIOS only OCing...
m
0
l
December 3, 2011 2:39:16 AM

Yea I turned off both cause my system was horribly unstable.
m
0
l
December 3, 2011 2:48:18 AM

The problem with BIOS is that I can't seem to change anything...apparently because this chip is locked???
m
0
l

Best solution

a b K Overclocking
December 3, 2011 4:04:52 AM

You can change the vcore and the FSB..when doing this type of OC you will need to underclock your ram to 1333 MHz as raising the FSB will result in raising the entire system clocks, example: lower RAM to between 1066-1333, then raise your FSB to say 240x16= 3.84GHz, and this will result in the RAM clocks being raised to 1599 MHz...raise vcore also IMO I would start out at 1.45v for the above scenario..or in the 1066 MHz scenario I would raise the FSB to 250X16 this will result in a 4.0GHz CPU and RAM at 1333 MHz I would set your RAM timings in this case to at least CAS 7 as CAS 9 1600 MHz is roughly equal to CAS 7 1333MHz RAM..I hope this helps


BTW..FSB also affects the HT and NB , so set your HT and NB clocks accordingly as well keep them around 2000 MHz - 2400 MHz...Essentially the FSB acts as the volume button for the entire system
Share
a b K Overclocking
December 3, 2011 4:05:54 AM

BTW ....The Multi is locked not the rest of the settings

CPU voltage on the 4.0 GHz on that chip stable would be 1.48-1.52v so watch them temps...That Chips voltage threshold is 1.55v so be careful. DANGER: BE VERY CAUTIOUS WITH THE VOLTAGES AND WATCH YOUR TEMPS UNDER 100% LOAD !!!!
m
0
l
December 3, 2011 5:08:36 AM

Ok so I got the chip to 4013 MHz...here is the link to CPU-Z



I will run the stress test now and see how it goes
m
0
l
December 3, 2011 6:22:15 AM

So after about 28 min of running Prime95 Blend Test I was sent to the famous blue screen with a System Service Exception error

CPU temp was around 52 C
m
0
l
December 3, 2011 6:34:43 AM

Im not sure where in the BIOS to change the Ram to CAS 7. Also I could only set the RAM to 1000 MHz and 1333 MHz...not 1066 MHz
m
0
l
December 3, 2011 7:14:32 AM

45 min into another Prime95 Blend Test I was sent once again to the blue screen with a Driver IRQL- Not Less or Equal error. Going to leave the setting for now and see if I can run normal programs and games etc. Hoping to see more advice in the AM. Thanks lowjack
m
0
l
a b K Overclocking
December 4, 2011 4:52:59 AM

What was the vcore setting on the 4 GHz OC? Try bumping the FSB down to 249...Well, if your setting is for 1000 MHz on the RAM you could go:

This is 3.984 GHz

FSB: 249
Multi: 16
RAM: 1000MHz OC = 1249 MHz
Vcore:1.47-1.5v
HT: under 2400 MHz
NB: under 2600 MHz

RAM latencies are adjustable in certain BIOS's ...I do believe that it would adjust latencies as per clock due to the chips SPD...SPD will adjust timings accordingly
m
0
l
December 4, 2011 10:02:11 AM

I set the FSB to 249MHz which moved the DRAM to 996MHz

I take it that VCore is Core Voltage which was set at 1.481250

HT set at 2241 and NB set at 2490

With those setting I restarted and couldnt get past entering my password to the computer.

I then changed the FSB back to 250MHz which put the DRAM back to 1000MHz

VCore the same at 1.48

I kept the HT at 2241 but changed the NB to 2257.

I was then able to log back into the computer with no issue.

Also my CAS Latency according to CPU-Z is 8.0 clocks

m
0
l
a b K Overclocking
December 4, 2011 12:54:30 PM

What does CPU-Z say your RAM speed is? at 249 FSB it should have booted as you could boot at 250 MHz...So, something is fishy with that...
m
0
l
December 4, 2011 8:03:31 PM



Says 501.7 MHz....so that is 1003 MHz?
m
0
l
a b K Overclocking
December 4, 2011 9:27:15 PM

Well, then push it up to 1333 MHz in the BIOS and see if that works for you
m
0
l
December 4, 2011 9:31:36 PM

Pushed it up to 1333 MHz and CAS is now 9.0 Clocks...no problems booting up.
m
0
l
December 4, 2011 9:36:40 PM

So
Core: 4013 MHz
CV: 1.48V
HT: 2257.6 MHz
NB: 2257.5 MHz
DRAM: 8192 MBytes @ 1333 MHz and CL at 9 Clocks
CPU Temp at 20 Celcius
m
0
l
a b K Overclocking
December 4, 2011 11:04:10 PM

So, you got it stable at 1333 MHz? Have you ran prime95 yet....small fft's?

Your RAM speed should be 1666.67 MHz with a 250 MHz FSB...Thats with the RAM set to 1333 MHz in BIOS as 250 MHz FSB is a 25% increase in RAM speed..So with that being the case you have CAS 9 @ 1666 MHz
m
0
l
December 5, 2011 12:43:59 AM

Yea its been stable all day...been playing games etc.

I will do the prime95 later....what is fft's?
m
0
l
December 5, 2011 4:15:18 AM

Best answer selected by rockon8729.
m
0
l
!