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640m: the same, but clocked slower, than the 650m?

post #1 of 21
Thread Starter 
I'm trying to find this information out. I've heard from some sources that the 640m and 650m are absolutely identical, save for a different clockspeed.

I'm curious about altering the core clock to benefit the speeds of my laptop. Its cooling more than manages the current 640m stock clock at peak temperatures. The manufacturer actually clocked the GPU 25MHz over what it's supposed to be, and it boosts to 710MHz (normally it's supposed to be 625MHz peak). Given they're already boosting it, I figured another 25-50MHz might not hurt.
    
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post #2 of 21

Pretty much. Except it uses GDDR3 for ram vs GDDR5 that the GTX 650M uses. 

 
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post #3 of 21
Thread Starter 
Quote:
Originally Posted by Lord Xeb View Post

Pretty much. Except it uses GDDR3 for ram vs GDDR5 that the GTX 650M uses. 

I'm really hoping someone has a link to someone who has already OC'd the 640m, or any information that really confirms my situation.

I believe the 650m also was GDDR3 just as the 640m was, and both were switched to GDDR5. Mine is a GDDR3 version unfortunately, however it appears that doesn't influence the performance in real-world situations.
    
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post #4 of 21

Don't overclock mobile platforms.

 
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post #5 of 21
Quote:
Originally Posted by Lord Xeb View Post

Don't overclock mobile platforms.

Tell that to mine plox. kthxbai
     
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post #6 of 21
Thread Starter 
Quote:
Originally Posted by Lord Xeb View Post

Don't overclock mobile platforms.

This is 2012. Not 2010 and earlier. Things are a bit different.
    
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post #7 of 21
Quote:
Originally Posted by PaulWog View Post

This is 2012. Not 2010 and earlier. Things are a bit different.

I don't think you really understand what you're saying. Laptops didn't just gain this ability to miraculously overclock within the last couple years.

Laptops have been capable of overclocking since they invented the first gaming machine. XD

It's nothing new, but you all are just now hearing about it so... you think it's a brand new never-before explored concept. rolleyes.gif
     
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post #8 of 21
Quote:
Originally Posted by PaulWog View Post

I'm trying to find this information out. I've heard from some sources that the 640m and 650m are absolutely identical, save for a different clockspeed.
I'm curious about altering the core clock to benefit the speeds of my laptop. Its cooling more than manages the current 640m stock clock at peak temperatures. The manufacturer actually clocked the GPU 25MHz over what it's supposed to be, and it boosts to 710MHz (normally it's supposed to be 625MHz peak). Given they're already boosting it, I figured another 25-50MHz might not hurt.


the 640M GDDR3 will still be slower even if it's at the same clock as the 650M GDDR5 version but there is a GDDR3 version of the 650M which even that is slower then the GDDR5 version.
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post #9 of 21
Its probly "safe" to do so, but i doubt that unless you are overclocking a more substantial amount than 25-50 mhz, you wont see a performance boost worth the trouble.
If you feel you can monitor your temps properly and feel comfortable with it, go for a higher overclock, otherwise i would just let it be.


TLDR; Go big, or leave it stock a small bump isnt worth it.
post #10 of 21
OC'd my 640m LE from 500/1000 to 900/1000 (650m clocks) using a VBIOS mod on my Sony Vaio S13. Runs beautifully at stock voltage.

Did a benchmark video of the 900/1000 if interested: http://www.youtube.com/watch?v=wRKqg6tnYIk
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