supaevensteven

I ended up sticking with 1100MHz/2200MHz and voltage at + .175mV to get it to 1.1V even though it seems to clock down to 1.063V after a few minutes playing a game with high GPU utilization. Temps have been 70 degrees for internal and 75 degrees ultrabay.

Damn that is one crazy overclock. I might try lowering my overvolt and see how my temps fair. I've been averaging 68 and 74 degrees for internal and ultrabay respectively. I'm glad I didn't upgrade after the mod I thougth win8.1 would work with the modded 2.02 (80.07.27.0.33) firmware?

Thanks for the temps Darworld. That's a decent score. I only managed to get above 5200 by setting both cards to 1125/2300Mhz. At that setting I felt I was getting to close to my ultrabays limits as it was getting temps in the high 80's after 20mins or benchmarking. That's a good suggestion to repaste the ultrabay, I recently bought some silver compound I'll give it a shot tonight. I should mention I'm overvolting both cards to 187.5mV and setting both the cpus to +310 (1100Mhz) for base clock offset, however you're right a long gaming session is really the only way to judge if it's really stable or not. I played a bit of Civ5 for only 1.5hrs with a lot of alt+tabbing to check the temps with nvidia inspector. I had issues when I set different lower clock frequencies on the ultrabay. At one point the card frequencies reset themselves. Is that an SLI limitation? Would you mind sharing your overclock values for both cards and voltages applied please?

Thanks Darkworld, Yeah I managed to flash from 2.00 to 2.02 stock BIOS then backed it up and modded it then flashed it. The Ultrabay was no problem either however it appeard to be on 80.07.27.00.3A and I flashed over it with the supplied modded vbios of 80.07.27.33 from the first post. Had no issues doing that. I noticed both cards have the base clock set at 835MHz now, I read others in this thread noticed the same. I don't really mind. I managed to get an overclock on both cards of 1100/2300MHz. I ran a bit of Alan Wake on Windows 8.0 and managed to get a solid 50+ fps at 1080p after tweaking the in-game settings a little bit. I also tested with 3D Mark 11. I didn't run this benchmark before I started this overclocking journey so I can't benchmark it at the stock 790MHz since it's locked to 835MHz now. I'd assume I would have got sub 4k @790Mhz. These are the before and after scores I got with the basic test : @ 835Mhz/2000MHz : NVIDIA GeForce GT 650M video card benchmark result - Intel Core i7-3630QM Processor,LENOVO INVALID @ 1050 / 2300MHz : NVIDIA GeForce GT 650M video card benchmark result - Intel Core i7-3630QM Processor,LENOVO INVALID I'm curious if it's worth upgrading to Windows 8.1 to gain better performance? I recently refreshed my laptop HDD from Win 8.1 to Win 8.0 and remember Win 8.1 had issues with usb midi devices, I managed to get them working with a registry hack but if there's no improvement in gfx I might steer clear of the upgrade for the dodgey usb midi reason. [Edit] I forgot to mention, under load playing Alan Wake and 3Dmark 11 I get termperatures of internal card : ~71c and ultrabay of ~81 while playing on at room temperature. The difference is in temps between them are about 10 degrees. What kind of temp ranges are you guys getting for your overclocks? [Edit] Just realized that the cards were maxed at 1055MHz so the result above is for 1050MHz not 1100Mhz which I originally posted. I bumped it up to 1100MHz and was able to run alan wake fine. Going to 1150 resulted in a crash.

H, i I was just wondering if the ultrabay rom on the first post "Y500 -Y400 - SLI 650m - 80.07.27.00.33 - OC.rom.zip " would work since I've flashed version 80.27.00.3A of the official vbios on my Ultrabay 650M card? Cheers, Steve