OC my 750M to 755M

Before someone comes and acts like a smartass, i am fully aware that the 750M and 755M are different cards due to having different firmwares

Now, with that out of the way, many of you are probably aware of the new Nvidiia GT750M, which is actually an overclocked 750M. Now i was thinking about overclocking my 750M through MSI afterburner. Only thing is i am slightly scared i will damage some hardware. However, the laptop i own (Lenovo Y410P) can be configured with a 750M and 755M, so i am aware it probably supports the required cooling to OC the card. Now, i will lay down the specs of both cards and what i need to overclock:

GT750M:
Clock speed 941 MHz
Memory clock speed 1,250 MHz

GT755M:
Clock speed 980 MHz
Memory clock speed 1,350 MHz

Aside from these two adjustable parameters, these cards are virtually identical. My power supply is 130W (which is a little overkill).

Now my questions are:

- Is 39mhz core 100mhz memory a big overclock or just a minor one?
- Do i need to tweak voltage?

 

it's a small OC, and you can push +135MHz + turbo 2.0 without any problems, the GDDR5 memory wont bottleneck many games..
watch ur temps and go for it !

 

Sweet thanks. Ill do it tomorrow, followed by a 2 hour gaming session (probably BF3)

 

Yep, as posted above, that's a small overclock you are seeking and I bet you can do higher if ever desired.... just watch temps and have fun, you won't need to overvolt until quite a bit higher than +39/100. As also mentioned above, Nvidia typical GPU's these days are unlocked up to +135mhz on the core without having to mod the vBIOS. What you are wanting should be easily achieved!

 

If you play at 1080p best to boost the vRAM as much as you can. It will be bottlenecked by the 128-bit memory bus. But in SLI mode it should be more than sufficient because it's technically only rendering half that resolution anyhow. And yeah, bumping to the max (without modded vBIOS) +135MHz isn't uncommon and still runs cool. vRAM, depending on type should be able to be boosted to +250 to as high as +500 depending on the vRAM type.

I didn't even know the 755m existed, lol. Looking at it now though, it looks like it is just a slightly faster clocked 750m. Same chip, same design, just default clocks are higher.

 

Ok so i put in the +39mhz core and +100mhz memory but it does nothing, the gpu wont throttle higher than 941 (stock limit)



Is this caused by bios or by drivers or is everything working ok?

EDIT: launched BF3 and core clock shoots to 1097....

 

Reason is the GPU is idling at 0% GPU usage due to Optimus. You have no game loaded. Run a game with MSI Afterburner in the background, alt-tab out of it and report back the clocks.

 

Is it normal that fan speed and voltage are greyed out? Also, it wont recognize my drivers, even though i am using stock 320.49.....

 

Yes. You cannot alter voltages on stock VBIOS. You need to flash a modified VBIOS for your GPU if you want to alter voltages. To control fans speed, the system BIOS needs to be modified.

 

Give that card the full +135mhz core OC and memory maybe 100-200mhz. Run a 3dmark11 or similar benchmark program run. Give it a few runs and make sure temps are under control, and that its not getting any weird artifact or crashing issues. If all looks good, you could play a few games and keep an eye on temps as well. Or you could bump up the clocks more and repeat.

I would also download setup an On Screen Display while gaming and keep monitoring temps while playing for at least a week or maybe even forever ( I always have mine up) and make sure everything looks good. It will allow you to see whats happening with the temps, GPU/CPU usage, and allow you to get an idea of what the fan profiles are like. Its more accurate and reliable of actual full load temps. If you simply close the game and check the max temp and current temp in HWMonitor you don't get a real idea of what the temps were averaging while gaming. Maybe they only peaked at 85C briefly before the fan profile kicked up the fans to max and kept them in the high 70s for the rest of your gaming period.

 

+135 is nothing for Kepler GPUs. You should just set it up to max and forget.
While +35 is a joke. It is not even overclocking for Fermi or even generation before

 

Ok thanks!

Thanks for all the help. Played some BF3 campaign, laptop doesnt seem hotter than usual.

If i eventually get the SLI cards ill consider OC'ing both of them, which equals a GT 775m

 

So were you able to overclock?
You should get msi afterburner so you can monitor your temps while you are gaming, mine went up ~5C after overclock but still I hardly hit 80C so im not worried at all

 

Im at 75-85C on mine. Using the OC'ing i mentioned in the OP. Ill do a little gaming then report back. Running smooth, i can finally enable 2x AA

Using EVGA precision.



Pic of the overclock with some BF3 in the background.

Thanks all. OC running stable and fine. Benchmarked it and it runs just like a real 755

 

I tried to oc my 750m ddr3 to +33/+250
Its stable and the temp hit 93c
using acer 482pg

 

755M is GDDR5

Acer V7-482PG uses DDR3 memory

 

Too big temperture. Don't overclock unless clean the fan, grill and repaste.

 

I bought it in october..
I dont worry the temperture:thumbsup:

 

this is my overclock setting, it is okay ? im getting P3k+ on 3dmark11

 

It's your laptop, it's only OK if it's working for you.

 

Hi guys,

I just received the y510p which came with GT755M. I was browsing the web and found a link to notebookreview according to it, gt 755m is nearly 9% better than 750m which does not make sense. There is only a difference of +39 core, +100 memory, but so large gaming performance which can makes sense when we look at memory boost 1250 is 8% more than 1150. So the performance difference is from the memory boost, apparently. Does that mean, I should overclock the memory on my gt 755m more than the core clock?

How much farther can I push before artifacts kick in? Can it go upto +135, +500? How much change in fps will it make? I intend to run crysis 3 on ultra. At present it hits about 15fps, anything near 20 will suffice.

Does % change in memory vs clock create more heat?

 

GT750M can be with GDDR3 and GDDR5. Perhaps in comparison they were referring to GDDR3 model. At first OC core up to +135.

 

I was looking into this and how is yours showing up to 500 MHz on the core clock in the P2? I'm using Nvidiainspector and P2's max is 135 MHz (as many people mention as "giving it the full 135").

Additionally, +300 MHz to the memory is stable. Maybe 320 MHz, but I got tired of trying. 360 MHz was not stable at max load, but stable with 50% GPU load.

 

93C is too hot for any GPU. Might be ok for short periods but if your GPU stays at 93C for extended periods you will shorten its life.