Ridiculous Overclock with 8600m gtddr3.

the 6000+ threshold is possible with a 8600mgt ddr3.
Having recently updated my forceware to 185.20, got out the old rivatunner again, needless to say, I ventured into the forbidden zone of a 675/1450/880 overclock.

NOTE: do not attempt this if you don't have a firm grasp on your laptop's possible temperature range. My test was done on a laptop cooler in addition.

Anyways, got an amazing 6245 3dmark 06 as a result. Temperature range stayed in 77.8 - 75.6 using RightMark monitoring.

Overall, Ive g2 say that a laptop cooler goes a long way for overclocking, and specific drivers can do alot to give that extra throttle push. 185.20 seems to be a relatively powerful/low temperature output driver to enhance performance on. Though take this with a grain of salt since other GPUs may react differently.

 

Very nicely done, dude. what notebook cooler are u using? how much difference does it make?

And here is a suggestion, keep your memory clock as low as possible because it's usually the first thing to fry on a GPU when stressed and doesn't even come with temp sensor.

Oh, another reason for not OCing the memory: Ocing the memory yields minimal gain in performance compared to OCing Core/shader.

 

So was the overclock stable? It's not just temperatures you have to worry about.

 

Ive only tested with left 4 dead as of now. It was running on max smoothly for about an hour. Think I should do a 2+ hour test?

 

Wow. Just Wow!

Your 8600m GT Seems as fast as a 4650!! Thats impressive!

 

Of course, it can't be considered a stable overclock without some serious stress testing.

 

Fun Furmark Stability Test or OCCT stress tests at your native resolution. You quickly learn your max temp.

 

Agreed, Furmark is best.

 

Not to mention that left for dead isn't exactly a very demanding game. Very nice score BTW ;-) I would be surprised that a such massive OCing would be be stable ingame. Also, your temps seem unbelievable.

 

Fixed for truth.


But seriously, that's a nice oc start.

 

Remember memory clocks have no temperature sensor. Not to worry you, but you are experimenting very high clocks with one model (8600m) which is known to have a high failure rate in comparison with the other models.

Anyways, you can also try the artifact test included in the AtiTool software.

 

Yeh, my laptops' also undervolted 2.2ghz running at 1.00V. Rofl at the other reply though, if I had a deep freezer in my house, I'd be overclocking like a mad scientist.

You guys are right on the demand side of things, for instance, MSAAx2 would drive my temperature range into auto shut-down for this overclock.

 

Then it's not stable and therefore an unverified overclock! It's sorta like doing suicide runs with a CPU, seeing how high you can go for the heck of it, but not leaving it there to play games!

If you can't stress your GPU to 100% and keep it stable while overclocked then there really is no benefit to the overclock.

 

Exactly, that's the point.
I have the secret of a perfect stable OCing but it's classified ;-).

 

Impressive until mine died I had it running at 565/1400/900. It was 100% stable and giving 75C max temps even in stress test. Returned 5818 points so a fair bit lower than yours. It seems hard to get a 8600M GT that will clock stably over 600+ on the core and over 900mhz on the memory. I think unless you are very lucky most 8600M GT can't go further without voltmodding.

To be fair his overclock seems fairly stable considering he can game for quite a while with it and carry out 3Dmark06 tests without suffering downclocks. Run ATI tool stress test for an hour or and you will see how warm it will get! Find your max core and shader clocks first then your memory and take into account that while your temps might seems safe your memory temp could be very high indeed and you wouldn't know so only use the highest stable memory clock if you need the power.

 

I agree. If he can game with the OC with all of his games and never have any temp problems, then screw the "omg, its not stable" crap.

 

And you have no idea why yours died, right?

 

Good job on the overclock. I got my 4650 to just a few points below 8000 on 3dmark 06...

 

To be fair my motherboard blew and took the card with it. Can't be sure therefore whether OCing killed it

Long live OCing
...so long as the warranty is there to cover it!

 

yeh, Im testing memory clock vs performance. Higher memory clocks doesnt seem to yield very much performance increase especially in the 800+ range. Ridiculous diminishing returns seem to set in there, and that make sense in my mind especially since gaming @ 1280x800 doesnt require as much memory as do higher resolution gaming.

Thinking about lowering memory clock will yield a higher stable core clock. Will return results later.

 

not entirely true. If a overclock allows me to play a game @Max settings without MSAA vs Med/High settings without MSAA, I'd take that anyday.

 

Hmm. Actually Ocing the memory will give you the most performance increase. Especially on a mid-range 128 bit card like the 8600M GT. Because the 128bit bandwidth is pretty limiting the only way to allow an increased core or shader clock to have an effect on performance is to speed up the memory speed so that more data can be transmitted through that narrow bandwidth more quickly.

 

500/1500/800: 6000 pts
600/1500/800: 6650 pts
600/1500/900: 6900 pts

A 100mhz memory increase ( only 12,5%) gives me 250 points more. Not negligible. Actually if you take the three variables separately (core, shaders and memory) and just OC them one by one, the memory gives the hugest boost proportionnally speaking.

I mean if you just OC only the core speed for example by 12,5%, it won't boost the score as much as a 12,5% memory OC.

 

first of all.............this 3dmark06 is in 1280x800 yes ???? (which means you scale off about 500 points)

second......i also been overclocking my nvidia (mobile) cards to maximum....i OCed 2 different go7900gs (the best OC card ever) from 3500 to 5500 in 3dmark06 with great temps.(only go7900gs who manage that)........but it started to get weird (like i said) after some moths.

let me give you a advice......after 3-4 months your card will start to give false message and behaves really odd......no mobile cards last with this clocks.

just a tip

 

agreed ^^.

unfortunately, it won't last. my experience with the 8600m gt was that it could handle quite an overclock (i went through several over two years - mine couldn't go quite as high as yours, but still ridiculously high), but the card is a ticking time bomb with or without overclocking, and the higher temperatures you get with OCing certainly aren't going to help.

hopefully you are under warranty or plan on having a dead notebook with a big repair bill.

 

and Mobile video cards are damn expensive...even on ebay

 

If I were you, I'd set up some kind of profile-switching so that your GeForce is only OC'd when you need that kind of power. Try and preserve it for longer.

 

Agreed. Anyone here can check my Signature?
I want to know how long will my Nvidia Geforce 9500M GS DDR2 last with this OC. Thanks.

 

Well if it does go, he could always oven it? lol

 

Just out of curiosity, how long have u been running with the OC? I suppose u flashed the Vbios to the clock in your signature, right?

 

I have been running OC for half year I guess. But not with 615/470/1415.
My older clock was 600/460/1385 and 610/466/1408.
I didn't flashed my BIOS at all. My signature was just validation of GPU-Z.

 

well, the temperature for the 675/1450/880 oc operates @ ~65 when Im doing normal work. And the core clock temp goes up in the range of 81-92 for most gaming apps.

I feel like its relatively safe consider thats pretty much the normal temperature range for stressed GPUs.

I realize that theres no monitoring for memory clocks, but shouldn't that be reflected in overall system temp? If oversystem temp during gaming is usually 85, think thats fine?

 

The clocks are perfectly acceptable. If you can game with them and you suffer no freezes etc then they are stable. Your memory and shader clocks are perfectly reasonable. Your core clock speed is enviable. Out of 3 8600M GT's(only one died ) I have owned 575 is the highest stable core speed I have got.

See if you can improve cooling even more. I recommend ICD 7 24 carrat thermal paste. It really cuts temps. Then push it to the max.

 

Well check ATI tool stress test first and scan for deltas. If that is stable then yeah go for it.

 

3DMark06 aside, are you seeing any improvement in games?

You could probably -50MHz each frequency and only lose like 1fps. So, is the stress worth it?

 

Depends on the reference point. Changing from 600 to 680 core clock yields me about 3 fps on average, but it can make a difference especially if game performance is hovering over the 30fps threshold.

IF i dont overclock, I can only play L4D on Medium, with OC, its on max without MSAA (it still runs fine with MSAA but it gets too hot).
OC also allows me to play COD4/Mass Effect/Assassin's Creed @max settings save MSAA. Resolution@ 12800x800.

To be honest, I was a bit surprised @ my overclock and performance as well. 8600m gt as always know to be a midrange GPU and expect to run most games @med settings. When I started OCing, I was unable to overclock beyond 550. I remembering scouring the laptop2go forums for drivers, eventually finding 174.75 which increased my clock speed to 580-600 range. I think the last threshold was crossed after getting a laptop cooler and undervolting my cpu.

 

Agreed. I can play Left 4 Dead with 1280x720/1366x768 and 2x AA as well as other setting all MAXIMAL with my current OC. Happy with it. LOL. 30FPS
Last time(before OC), I can play Left 4 Dead with 1366x768/1280x720 and 0 AA with Shader Setting Medium and other setting MAXIMAL only. 30 FPS

 

That's cool. As long as you're seeing real results, go for it. Just keep your warranty up to date.

 

congrats dude