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AthlonII X4 620 3ghz Overclock?

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  • Overclocking
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November 22, 2009 6:53:44 PM

I am planning on buying an athlonII x4 620 and hope to overclock it to 3ghz. (A rather small overclock compated to others) But, I was wondering if any of you have already done this and could give me the speeds you set everything at? thank you!

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November 23, 2009 8:00:02 PM

Once you are done installing the CPU go into the bios and raise the FSB a bit till you get 3Ghz.... as simple as that.... ;) 
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December 2, 2009 7:37:24 PM

You can get more then 3Ghz with an Athlon II 620 x4 on stock Volt and stock cooling.(Better cooling helps always)
I use a GIGABYTE MA785GMT-UD2H Mobo myself and it's very stable with the settings here.

Stock settings
FSB=200
200x13=2.600Mhz CPU
200x10=2,000Mhz NB
200x10=2,000Mhz SB
200x8=1,600Mhz(PC12800) x6.66=1,333Mhz(PC10666)

OC Settings
FSB=250
250x13=3,250Mhz CPU
250x8=2,000Mhz NB
250x8=2,000Mhz SB
250x6.66=1,666Mhz Memory

This is all done stable on stock V-Core.
I've run 10 hours of Prime95 in Windows 7 x64 no problems.

Recomendations
Get PC12800 memory, it's made for 1,600Mhz so it's better overhead for OC.
Get a good aftermarket Heat Sync or do a proper Lapping of the Stock Sync.
Use good Heat Compound like Arctic Silver 5.
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December 9, 2009 8:24:00 PM

Thavion Hawk said:
You can get more then 3Ghz with an Athlon II 620 x4 on stock Volt and stock cooling.(Better cooling helps always)
I use a GIGABYTE MA785GMT-UD2H Mobo myself and it's very stable with the settings here.

Stock settings
FSB=200
200x13=2.600Mhz CPU
200x10=2,000Mhz NB
200x10=2,000Mhz SB
200x8=1,600Mhz(PC12800) x6.66=1,333Mhz(PC10666)

OC Settings
FSB=250
250x13=3,250Mhz CPU
250x8=2,000Mhz NB
250x8=2,000Mhz SB
250x6.66=1,666Mhz Memory

This is all done stable on stock V-Core.
I've run 10 hours of Prime95 in Windows 7 x64 no problems.

Recomendations
Get PC12800 memory, it's made for 1,600Mhz so it's better overhead for OC.
Get a good aftermarket Heat Sync or do a proper Lapping of the Stock Sync.
Use good Heat Compound like Arctic Silver 5.


Thank you! I have A coolermaster v8, arctic silver 5, and 1333 memory. If I wanted to just get simple 3ghz I would raise the fsb to 231 to get 13*231 = 3003mhz(3ghx) right?
THanks for all your help!
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December 9, 2009 8:37:30 PM

That's well withing the stable for this CPU.
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December 9, 2009 9:06:48 PM

Thavion Hawk said:
That's well withing the stable for this CPU.


But my calculations to reach 3ghz are correct right? Thanks! :) 
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December 9, 2009 9:53:57 PM

Yes your math is correct; however you must note that your Memory, North Bridge, and South Bridge are all linked to FSB as well as your CPU. Setting your FSB of 231 will result in memory at 231x6.66=1538.46 which is a large OC using 1,333Mhz memory or 231x5.33=1,231.23Mhz which is a substantial UC. I'd recomend dropping the Core Multiplier and Memory Multiplier together wall increasing the FSB to achieve your target.

Here is a set of clocks that should work for you.

FSB=250 | 25% Increase in clock
CPU=12x250=3,000Mhz | Lower core multiplier from 13x to 12x
NB&SB=8x250=2,000Mhz | Stock NB and SB by dropping from 10x to 8x(I've found 9x250=2,250Mhz is stable for me)
Memory=5.33x250=1,332Mhz (Drop the Memory Multiplier to offset the higher clock speed)

The settings above should give the target 3Ghz CPU wall retaining a stable Memory Clock, North Bridge and South Bridge.
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December 10, 2009 1:02:17 AM

Thavion Hawk said:
Yes your math is correct; however you must note that your Memory, North Bridge, and South Bridge are all linked to FSB as well as your CPU. Setting your FSB of 231 will result in memory at 231x6.66=1538.46 which is a large OC using 1,333Mhz memory or 231x5.33=1,231.23Mhz which is a substantial UC. I'd recomend dropping the Core Multiplier and Memory Multiplier together wall increasing the FSB to achieve your target.

Here is a set of clocks that should work for you.

FSB=250 | 25% Increase in clock
CPU=12x250=3,000Mhz | Lower core multiplier from 13x to 12x
NB&SB=8x250=2,000Mhz | Stock NB and SB by dropping from 10x to 8x(I've found 9x250=2,250Mhz is stable for me)
Memory=5.33x250=1,332Mhz (Drop the Memory Multiplier to offset the higher clock speed)

The settings above should give the target 3Ghz CPU wall retaining a stable Memory Clock, North Bridge and South Bridge.

I cannot thank you enough for all your help! I am a bit of a organization freak wanting to just have 3ghz and nothing higher but thank you so much for all your help! Your math really helped:D  THANKS! :)  :)  :) 
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December 10, 2009 2:54:44 AM

No prob.
Athlon II chips are grate for overclocking because they're actually lean cut Phenom IIs. AMD took the Phenom II Deneb Core, dropped the L3 cache from the die, and dubbed the trimmed chip a Propus Core. Athlon II chips are not only cheaper to make, they run cooler, use less power, wall still running on the same silicon with the same top ends for power and temp as Phenom IIs. Not having 6MB of L3 cache makes for about 15% loss performance based on several reports. You're target 3Ghz is an OC of just over 15% so you're potentially making up for that lack of catch and saving a chunk of change at the same time.
All that aside; you're welcome and enjoy the gold that you've struck in buying an Athlon II x4 620.
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March 8, 2011 6:07:26 AM

I've got the same mobo, but with the AMD Athlon II x3 2.8 ghz processor, G.Skill 2x2gb DDR3 1333mhz ram, Thermaltake 600w ps, overclocking it to read:

AMD Phenom II x4 3.26ghz processor, G.Skill 2x2gb DDR3 1800mhz ram and she's as stable as if the real components were there.
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