I wanna Overclock My GT 650M to GTX 660M!

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shaks109

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Jul 25, 2012
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Hey, I want to Overclock my GPU (GT 650M) so it has similar performance as the GTX 660M or something around it performance.
I'm using MSI Afterburner to overclock but i don't know what to overclock (everything is at +0)

Should I increase the Core Clock (MHz) or the Memory Clock (MHz)???
 
Especially since your 650m has 900Mhz GDDR3, it won't ever reach the 2Ghz of the 660m's GDDR5. You might be able to squeeze 1Ghz out of that GDDR3 and you'd probably be able to get the necessary 835Mhz out of the GPU but it will be extremely hot if it works, and the worst case scenario is that you fry the GPU/RAM.

RAM has a surprising effect on your GPU. If the 650m had GDDR5 I'd say you could get pretty darn close, if not equal, performance. The Radeon 6770m in my laptop wouldn't be nearly as fast if it had GDDR3, but the GDDR5 it has gives it about a 20-50% performance boost over the theoretical GDDR3.
 
Slowly increase the clock on the RAM. Don't jump from 900 to 2Ghz or you'll blow it to hell. You have to test it one step at a time, but keep in mind that the factory clocks were set like that for a reason: If that particular chip was capable of performing at 660m levels then it would've been sold as such, the same goes for the RAM. AMD and nVidia usually develop many versions of cores from their cuts based on performance post-fab... meaning if one or two from a pallet test slower than the others, the whole pallet is bumped down in specs.

You may very well be able to get it to 2Ghz and 660m specs/performance but you may also burn everything out. Be careful!
 
The difference in performance between a 650 and 660 is fairly huge, overclocking isn't gonna get you there....

overclocking and laptops don't really mix....
 
I wouldn't arse around overclocking the memory clock as I never get a noticable performance increase unless I'm messing around with benchmark programs. Just stick to overclocking the core to begin with, increase by about 10-20mhz a time then play a game or a benchmark and see if it runs without artifacts or crashing.
 
Oh and another thing if it is not already enabled on the overclocking program, make sure you lock the core and shader clocks together as I've read that if they are not in sync it can cause problems.
 


Like this? (to you right where it says '+20 MHz'

http://img.techpowerup.org/121002/nvidia_20121002_182414.png
 
Yeah your core clock and shader clock must be factory locked together so don't worry about then, get the heaven benchmark run it and then save the score then have a dabble at increaseing the core then run heaven again and see what kind of performance you get and whether it is stable or not.
 


Yeah that is right but I've never used that program before, use afterburner because then you can use your own made fan profile. Some people like Evga precision but I've never found it that good. Asus gpu tweak is pretty good, asus smartdoctor is ***, it knackered my computer up did that program.
 
Just go to guru3d.com all the bench and test files are there to get. Also at Dark the 600 series of cards all have locked shaders/core clocks. They both run at the core clock speed. Another also the memory makes a huge diffrence and needs to be over clocked if you are going to use higher res and or AA of any sort.. Just bump up all the settings in afterburner till you get artifacts or a crash then back it down a bit there is little worry about killing it on the new cards they have a self thermal limiting that most of the time will prevent them from killing themselfes lol... I will say from my own exp that overclocking laptop hardware does not get you that much they always overclock less than a desktop part and make more heat/eat up more battery so dont leave it maxed out unless you are on power and have this laptop on a desk or a cooler where it can have good airflow.

Thent
 


I own the Lenovo Y570, with the 2410m and a GT555m with a base clock of 752Mhz. The CPU would often hit thermal limits, and the GPU would only cap out at ~77C.

I decided to overclock the GPU for a bit of extra performance, and surprisingly I hit 900mhz without any problems (Didnt feel the need to test any higher) and my temperatures only went up 4C. That's a 150mhz overclock on a laptop chip.

That in mind, as long as you are within thermal limits laptop overclocking is perfectly fine. There are no voltage controls so you really can't get as far with a laptop, but a lot of laptop parts are just downclocked versions of the 'higher class' chips.

As you said too, heat is the only issue, but it's certainly not one to overlook. Leaving it overclocked is fine though, the clocks are automatically curbed off when not on AC.
 
FYI: If you've got the GDDR5 version, the 660M and 650M are almost identical, core wise
http://www.gaminglaptopsjunky.com/gtx-660m-vs-gt-650m-gddr5-the-same/

OC'ing with this particular chip shouldn't hurt thermals too much, just power consumption. But, of course, watch your temps. Typically builds with a 650M aren't built to dissipate heat as well as those with 660M's so that's where overclocking both to their max should yield a benefit for the 660M.
 
Update: I've been overclocking my GT 650M and it works great with the +135MHz core boost (880MHz, 969MHz w/ boost) with NVidia Inspector--not a single crash so far. I haven't played a lot with the memory, but mine hasn't had an issue with a 100MHz memory increase (2100MHz).

The issue I've had is that the overclock does not consistently take. It often shows 880MHz as the setting, but only reads out on GPU-z and other sensors at 745MHz with appropriate stock performance.
 


On my alienware m14x r2 i can crank the core all the way up and add 200 mhz to the memory no problem. I do keep it raised up about an inch to allow airflow. but at 969 mhz it doesn't go above 60 degrees Celsius. I also disabled intel turbo boost cuz its dumb and just adds 90 extra degrees into the mix. BTW the card will automatically slow down at 68 degrees so you don't have to worry about heat, just don't change the voltage. but with the over clock at 969 mhz and my cpu at 2.7 ghz i get more than satisfactory performance. I've heard it will run crysis 3 on med. settings in 720 and low settings at 1080. (i could run the beta on high without overclocking)
 
Hi there tomckeenan ... i have the same rig as yours ... im guessing yours is GDDR5 ... i Have increased the core to 969 and Mem to 2500 ... my temps hit max 62 and that too only on sleeping dogs for some reason ... ive tried on crysis 3 (custom with hgh settings), Remember Me with max settings ... Tomb Raider on Ultra .... BioShock with max settings .... none of these games have given me any issue and tmps have stayed within 60 ... however when i run sleeping dogs, after 20 min of play the game goes to windowed mode and an error pops up saying display driver has stopped working and has recovered .. i just see a blank screen ... can hear all the background noises and i can even move wei around .. just tat i cant see it ... any idea y this is happening ? Should i increase the Voltage ? with the current clocks the voltage is 1.037 V
 


Hi there, I suggest you try Nvidia Inspector instead because all you have to do is edit the batch files and set the clock or memory to ANYTHING that you want. I have included two screenshots of the clocks I've been running now for 2 weeks and without any problems.

Here's what I use:

C:\Users\xxx\Desktop\OC\nvidiaInspector\nvidiaInspector.exe -forcepstate:0,0 -setGpuClock:0,2,1220 -setMemoryClock:0,2,2580

I just want to mention I have not been very successful with over-clocking the memory of the 650m at all. Although I know some people have claimed to reach 3000 Mhz memory with the same card I can only manage +730 MHz (2730Mhz) before running into problems. My solution for now and I see no reason not to, is to just leave it at 2580 MHz because that is the point which I have no problems with whatsoever. For the clock speed I simply kept it at 1215 MHz when I need to game and when I'm not I use the program to lower it back to default, which is 745 MHz Clock and 2000 MHz memory.

According to GPU-Z temperature and SpeedFan monitoring the maximum so far during heavy load is 68C, except when I was testing 1240 Mhz clock speeds which usually forces me to use task manager to close the program before it hits 70C.
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I don't know if this is useful at all but I hope it was worth reading. Thanks and have a nice day.
 
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