How to overclock my C2D E7500?

February 9, 2012 at 23:23:14
Specs: Windows 7, Core2Duo E7500
Hello friend, first of all thanks for replying to my previous posts. Your suggestions and guidance helped me a lot.

Now as i had purchased C2D E7500, i want to overclock it. I am a total beginner in this field. I searched a lot on net and forums, got various ideas, used clockgen but i am not able to OC my cpu. Then, at last, i tried from my BIOS. I edited Bus Speed there. Initially it was 266 and multiplier is 11. So i incremented Bus Speed with 5. My system OCd very well upto the Bus Speed of 299 but on 300 it got unstable after logging into my user account. It so happened that PC logged in successfully but after 5 mins. a blue screen came and said "Dumping to Trash...." or something like that.
At that time i remembered that somewhere on the net i had read that we also have to increase Vcore voltage and have to OC the RAM. So, i got helpless because i didn't saw any editable field in BIOS for the same.
So, i request you people to please guide me in this field. Please give me step by step instructions if possible. And also tell me what softwares shall i use for it and how to use them. The detailed specs of my PC are as listed below. Also i am posting CPUZ screenshots (without OC) so that you could get better idea of my hardware. Thanx.

Mainboard- MSI G41M-P26

CPU- Intel C2D E7500, 2.93 GHz, 3 MB cache, FSB 1066

RAM- 4 GB DDR3, Dual channel

See More: How to overclock my C2D E7500?

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February 9, 2012 at 23:42:31
Overclocking is undertaken via BIOS not Software, if the Motherboard does not have the options you will not be able to achieve much.

Have you got a copy of the Motherboard Manual ??

Googling is quicker than waiting for an answer....

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February 10, 2012 at 05:38:19
You are missing some specs
Your Manual:
Disable EIST and C states
Set FSB/DRAM Ratio 1:1, later if your memory will not be over it's rating, you can try 1:2
Make sure PCI-E freq is set to 100
You are probably better off with your Frequency set to 333 and your multiplier set to 10 (rather than 300x11) since your FSB would be 1333, your memory would be 667 (1:1 Ratio) or 1333 (1:2 Ratio) if you purchased the better memory. That should max out your board's FSB and give you 3.33GHz CPU
Your manual does not mention V-core settings but it may be there, but with these settings you may not need it. If you do adjust your cpu's voltage, just increase it just a small step or two at a time, usually a few hundredths of a volt in a step.
Do not forget to monitor your internal temperatures with Speedfan or similar at idle and under multiple loads (antivirus scan and game, etc.) and then do a full stress test to check stability if your temperatures are reasonable.

You have to be a little bit crazy to keep you from going insane.

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February 10, 2012 at 05:41:01
When overclocking a Core 2 Duo system, there are 2 important things you should keep in mind:

1. the faster the FSB, the better the performance.

2. the optimal CPU:DRAM frequency ratio is 1:1 or 1:2. Hopely you understand the difference between FSB, DDR speed rating, & frequency?

The default clock settings for your E7500 are 11 x 266MHz (2.93GHz). The optimal RAM would be DDR3-1066 (533MHz) & would allow a 1:2 ratio. If you were to lower the CPU multiplier (aka CPU ratio) to 9x & raise the CPU frequency to 333MHz, the CPU would run at 3.0GHz (which is an extremely minor increase from 2.93GHz), but the system would "perk up" due to the faster FSB (1333MHz). The RAM should be configured to run at either 333MHz frequency (1:1 ratio) or 667MHz (1:2) ratio. You didn't state which speed RAM you have so I can't suggest which would be better. Once you have the CPU:RAM frequency ratio straightened out, you can go back & try raising the CPU multiplier.

9 x 333MHz = 3.0GHz
9.5 x 333MHz = 3.17GHz
10 x 333MHz = 3.33GHz
10.5 x 333MHz = 3.5GHz
11 x 333MHz = 3.67GHz

If the system becomes unstable, you'd need to either back off on the overclock, or try increasing the CPU voltage to help stabilize. Intel states the voltage range for your CPU is 0.8500V-1.3625V. As long as you stay within that range, you should be safe.

Make sure you're running BIOS version 26.8.

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Related Solutions

February 10, 2012 at 06:58:09
here are the readings of my system from CPUZ-------


Name- Intel Core 2Duo E7500
Codename- Wolfdale Max TDP-65W
Package- Socket 775 LGA
Technology- 45 nm Core Voltage- 1.264 V
Specification- Intel (R)Core(TM)2 Duo CPU E7500 @ 2.93GHz
Family- 6 Model- 7 Stepping- A
Ext. Family- 6 Ext. Model- 17 Revision- RO
Instructions- MMX, SSE 91,2,3,3s,4.1), EM64T, VT-x

Clocks (Core #0) Cache
Core Speed- 2933.0 MHZ L1 Data- 2x32 Kbytes 8-way
Multiplier- x 11.0 L1 Inst.- 2x32 Kbytes 8-way
Bus Speed- 266.7 MHz Level 2- 3072 Kbytes 12-way
Rated FSB- 1066.5 MHz

Selection-------{Preocessor # 1} (Faded Out) Cores- 2 Threads- 2

Type- DDR3 Channel #- Dual
Size- 4096 Mbytes DC Mode- Symmetric

DRAM Frequency- 533.3MHz
CAS# Latency (CL)- 7.0 clocks
RAS# to CAS# Delay (tRCD)- 7 clocks
RAS# Precharge (tRP)- 7 clocks
Cycle Time (tRAS)- 20 clocks
Row Refresh Cycle time(tRFC)- 86 clocks
Command Rate (CR)- 2T

Please inform me are these readings sufficient or shall i post SPD readings also from CPUZ?
Please explain whatever you want to tell in some easy english as i am from India. Anyways thanks for replying me. As per my BIOS i haven't seen any editable field for VCore voltage, if i am missing out on something in BIOS then please tell me.

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February 10, 2012 at 07:48:27
"FSB:DRAM- 1:2"

It appears you have DDR3-1066. If that's the case, your RAM probably isn't going to be able to handle 667MHz so you're going to have to reconfigure the ratio to 1:1. That means you'll have to underclock the RAM to be able to overclock the CPU. Other than that, everything you need to know has been explained.

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February 10, 2012 at 20:49:54
Hello, can you please tell me where and how to increase or decrease Vcore voltages and CPU multiplier? I searched through my BIOS but couldn't find it. And yes, my BIOS version is 26.8. Please help me out.

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February 11, 2012 at 05:27:27
Did you download your manual from the link above?
You can manage to OC w/out vcore, it will just limit it a bit.
You cannot effectively OC w/out being able to adjust the multiplier.
Usually you need to set the CPU/Freq settings to manual, then you can access the adjustments.

You have to be a little bit crazy to keep you from going insane.

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February 11, 2012 at 07:55:53
The multiplier setting is in the Cell Menu. It's called "Adjust CPU Ratio". There doesn't appear to be CPU voltage (vcore) adjustment. Make sure to disable Spread Spectrum & set the PCIe to 100MHz.

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February 11, 2012 at 20:26:41
Thanx all for your support. As told by you i disabled spread spectrum. And for editing the multiplier i had to disable Intel EIST option. After that i reduced the multiplier to 8 and left cpu-fsb freq. as it is then system ws stable and it underclocked very well. But when i tried to overclock it by keeping multiplier to 8 to 11 and increasing cpu-fsb frequency it didn't started.

These are the specs of my BIOS in CELL MENU when i again set it to default values. Please tell me what shall i increase or decrease to overclock it to atleast 3.5 GHz. Also it's worth mentioning here that my BIOS gives the option to edit CPU multiplier only when i disable Intel EIST.

Cell menu

Current CPU Frequency 2.66GHz [266x11] (Greyed)
Current DRAM Frequency 1066 MHz (Greyed)

CPU Specifications [Press Enter]
Intel EIST [Enabled]
Adjust CPU FSB Frequency [MHz] [266] (Min: CPU Default
Max: Min+500MHz)
Adjusted CPU Frequency [MHz] 2926 (Greyed)

Memory Z [Press Enter]
Advance DRAM Configuration [Press Enter]
FSB/DRAM Ratio [Auto] (1:1.50,
Adjuated DRAM Frequency [MHz] 1066 (Greyed)

Adjust PCI-E Frequency [MHz] [100] (Min: 100 MHz,
Max: 115MHz)
Auto Disable DRAM/PCI Frequency [Enabled]

Spread Sprectum [Enabled]
I am also giving Min and Max values for whichever terms my BIOS displayed. Also, i had written "Greyed" for the fields which are read only in my BIOS.

Please help me out with this, i will be really grateful to you all, specially "riiders" and "fingers".

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February 18, 2012 at 12:10:33
Hello members, specially to "riiders".
I had posted CPUZ specs of my system. Please guide me now. I'll be very thankful to you.

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February 18, 2012 at 13:12:15
Everything is recommended above. DISABLE EIST. Fix PCIe at 100. DISABLE Spread Spectrum. Since you do not have 1333DDR3 RAM (667Freq) then set Ratio to 1:1 if possible for the best communication with your CPU, it will work at the 1:1.2(800DDR3) or 1:1.6 (1066DDR3) but these are not optimal. Once these are set, set your Freq. to 333 and start with your multiplier at 9. Test and is you have stability and your temperatures are reasonable, then raise the multiplier by 0.5 at a time until it becomes unstable or becomes too warm and then back down on the OC. Test thoroughly again for long tern stability and temperatures under all loads.
Let us know how it goes.

You have to be a little bit crazy to keep you from going insane.

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