NotListed

Yes, with my Y400 with the latest rev of the file I was able to unlock my GT750 gpu to overclock/underclock by 550mhz. I also confirmed my bios is unlocked and the white list mod works, I was able to install a 6235 and get much better wifi connectivity with out losing bluetooth.

I've just downloaded for my Y400 with GT750m and ran through all the steps from the original post but I am still not able to move beyond +135mhz on the built in GT750m

Never mind I read your post about what your ultrabay was (misread it the first time through). 2.0 pcie 8x ultrabay. Most desktop boards (not counting enthusiast/server classed boards and chipsets) negotiate down to 8 lanes x 8 lines per slot electronically so being pcie 8x on both isn't too abnormal of a configuration.

The integrated GPU on my Y400 with GT750m is reporting PCIe 3.0 8x per GPUz. Octiceps is your integrated GT650m 3.0 pcie or ultrabay 2.0 pcie? Just curious about what my ultrabay might be. Also assuming there is not whitelist for the ultrabay the thing I was curious about but don't want to put the money down to experiment is if the gpu's could be separated instead of SLI use one for GPU and one for PhysX. Like for example I have Y400 with GT750m, if I bought a GT650 could I use it as PhysX? Or in the case of Octiceps if he bought the GT750M ultra bay (which just went on sale on Lenovo's site for the Y500) could he do a similar configuration? Headsets, Speakers & Graphics Cards | Lenovo | (US) Honestly I don't think I would go down that road even if I had the money because if the Y500 ultra bay GT750m came out for sale the Y400 version can't be more then a couple months behind (Pessimistically speaking, I hope much sooner then a couple months).

FYI, Sent a pm to svl7 with my bios to take a look at when he has time and thanks in advanced. Also this is what my nvidia inspector looks like. Though sliding the voltage around and applying didn't seem to change what the voltage was registering. It was at 1.118v the whole time, when I overclocked it by 135mhz it jumped to 1.125v but never beyond that no matter what I did with the voltage slider. Also the Priorize Temperature feature worked moving the slider around and applying it would cause the fan mhz and voltage to throttle down/up to maintain that temp with in around 1C variation. I used furmark to simulate load and since base clock offset and temp setting and memory clock worked in real time (can apply and settings take effect immediately) the voltage settings should as well if it worked so I have to assume it isn't actually doing anything.

I do not have 750M SLI. They don't yet have the Y400 gt750M ultrabay for sale and do not sell the Y500 gt750m ultrabay part separate from a "IdeaPad Y500 Laptop - Dual Graphics - 59371963" unit which already has it installed. As far as playing with the voltage I the slider on nvidia inspector worked (I've not had time to install anything more to verify changes or anything so it could be it did nothing). I'll take dump of my bios next chance I get. As far as updating drivers, if you use anything beyond lenovo's drivers right now you have to manually add your laptops hardware id info to nvwin.inf as the GT750m doesn't exist (GT740m does in latest beta's though) in the drivers folder and to install beta drivers you first have to reboot your machine with test signing turned on but that gets tricky with secure boot enabled... to update drivers these are the shortest steps I've cobbled together 1. Windows Key + X 2. Select "Device manager" 3. Expand display adapters doubleclick on your video card 4. Look at detail tab, in property drop down select "hardware id" 5. note your Ven, Dev, and subsys values mine for example is "PCI\VEN_10DE&DEV_0FE4&SUBSYS_380217AA" 6. visit LaptopVideo2Go: Drivers populate device search field 7. Download inf file for driver you attempted to install overwrite in the extracted location (location for me was "C:\NVIDIA\DisplayDriver\320.00\Win8_WinVista_Win7_64\International\Display.Driver") 8. Windows Key + R 9. Enter “shutdown.exe /r /o /f /t 0″ – this tells the computer to restart and prompt how you want to start 10. The system will restart to a menu allowing you to change how it boots. 11. Select “Troubleshoot” 12. Select “Advanced options” 13. Select “Windows Startup Settings” – this will restart Windows and let us change the boot options 14. Click “Restart” button 15. System will restart to “Advanced Boot Options” screen 16. Select “Disable Driver Signature Enforcement” – this tells the computer to booth without forcing signed drivers. 17. Reboot the computer and install the driver from the extracted folder (for me it was "C:\NVIDIA\DisplayDriver\320.00\Win8_WinVista_Win7_64\International\setup.exe") 18. Reboot disable driver signature enforcement will be enabled again.

octiceps Updated with nvidia 320 beta drivers and got a 49 to 60 point bump. The 60 point bump made not changes to config except I did noticed phsyx score was 7400 something... so with out bios mod you at the whim of turbo core working in your favor P3276 NVIDIA GeForce GT 750M video card benchmark result - Intel Core i7-3630QM Processor,LENOVO INVALID score: P3276 3DMarks P3287 NVIDIA GeForce GT 750M video card benchmark result - Intel Core i7-3630QM Processor,LENOVO INVALID score: P3287 3DMarks Played with voltage and memory a little and playing with both did nothing to my 3d mark score. Also upping memory above 100 or more started to cause artifacting and adding a slight bump to voltage didn't help. (in both cases at the first signs of green lines or dots I stopped bench marking) As far as memory is concerned on my desktop going from 1333 to 2133 raised 3d mark by 20 points consistently so it doesn't really show much of anything in that bench mark. But it in the case of my desktop did shave off like 1 min in encoding large files and some barely perceived (if at all) responsiveness increases so in general it is only a minor to no perf bump for gaming (at least as I've observed). If I was using an APU or Intel's integrated gpu or a video card with sub 500mb of ram and it it utilized buffering to system ram more I would probably see more of noticeable difference but that has never been the case for me. Memory does appear to be clocked at what it says it is all over as far as I can tell 3Dmark11 says is @1000mhz [ATTACH=CONFIG]7189[/ATTACH] cpuz is jumping between these two numbers 1064.3mhz 1064.4mhz If it was ddr3 1600 it would say 800mhz If it was ddr3 1333 it would say 667mhz Also I would like to give a thanks svl7 as well. And if you need a dump from me for the GT750m Y400/Y500 let me know (also I haven't read the whole thread yet so i would need to know how as well)

I haven't had real time to sit down tweak and play with my Y400 yet (working long hours and even at work right now as I speak) I have only made one modification to my laptop. I replaced stock memory with Kingsont Hyperx 2133 ddr3 sticks (still 8gb) so I don't know how much that will skew my results. I've made no software modifications or driver updates. This is stock clock speeds P2932 NVIDIA GeForce GT 750M video card benchmark result - Intel Core i7-3630QM Processor,LENOVO INVALID score: P2932 3DMarks This is with 135mhz + to gpu clock and no change to the 2500mhz dd5 speed P3227 NVIDIA GeForce GT 750M video card benchmark result - Intel Core i7-3630QM Processor,LENOVO INVALID score: P3227 3DMarks If I got newer drivers on there, tweaked the memory speed and I'm sure I could bring these numbers up some more. svl7, do you know if this unlock bios and whitelist mode will work for my version of the Y400?

I've made no modifications to this laptops firmware yet as I was unsure if this mod/update were safe/compatible for this model. Here is the a screenshot of systeminfo and it looks like bios v2.02 but unsure if it is same

I literally just got my hands on my own Y400 (non-sli) with GT750. It's DDR5. I'd be interested in in finding out if this whitelist and unlocking works on this model? Please let me know what you would need me to do? Thanks.