milotait

U need contact Klem, he made a bios with overlock feature. I flashed it and works fine for me.

I bet u using windows 8.1. In win 8.1 u must update the 2nd card bios to work properly, and if u need oc the 2nd card u must search updated and unlocked oc bios for the ultrabay card. Someone in this thread posted a bios.

I flashed this bios too. In this bios the ultrabay VGA has a different max clock then the integrated. integrated Max 790Mhz boost 835Mhz, Ulrabay max 836, boost 836. So when u overlock u need 46Mhz less in ultrabay card to get the same overlock speed in both card.... For example: U like to overclock booth card core spped to 1000Mhz in Nvidia inspector u need set card 0 +210Mhz, card 1 +164Mhz. PS: I think wee need pm KLEM to change the 650M vbios core clock to default state...

Is there any chance to we get new modded vbios (for win 8.1)? Or im just blind and not find the new bios?

Lenovo answer today: Hi All, I've just got an update and expecting the development team to release the vBios soon next week or two. Will update you guys later with the progress. Thanks! Regards, Cleo

We got answer from lenovo, in official forum: All, I appreciate the frustration, and I know you have been working on this since September. That said, we couldn't escalate issues to engineering until Windows 8.1 became official. We passed that gate on the 17th, so it is fair game now. I saw your tweets, and also note that this thread has gone from 1 to 8 pages, driven by some very motivated folks. Please keep in mind that the forum is primarily peer to peer, and as you scan other boards, there are plenty of threads demanding Lenovo attention, so you aren't being deliberately ignored . I acknowledge your concerns and we'll try to help you get this solved. It may be that development teams already know about this - I'll need to look into it to see what is already in progress. We can open a new case based on this discussion. I think one of the recent comments urging a recap of the situation is helpful. We need to focus on how the Lenovo provided drivers don't work, and the symptoms - the 2nd card isn't recognized at all, doesn't work in games, produces blurry graphics etc. If you want to reference Nvidia OEM versions, that's great, but we can't focus the case on them since we support our versions. I appreciate your help. Thanks Mark

What is the driver version in your machine? Because when i installed 320.49 then i can enable sli and work in 2d but after when i start a game it crash only restart works...

If u wish run new games with SLI then dont update....

Official answer from geforce forum posted by a moderator: ["ManuelG"] Changes to WIndows 8.1 and how it treats adapters connected to a display requires a VBIOS update for the 2nd GPU. You will need to contact Lenovo for this.

There is already a thread: http://forum.techinferno.com/lenovo-ibm/4820-svl7-we-need-you-windows-8-1-a.html

I think this is not a vbios problem....

Lenovo answer today "http://download.lenovo.com/consumer/mobiles/nvga138w8164.exe" this put up 307.64 driver on win 8.1 and its work!!! I hope this is not the only solution because we dont have support for newer games....

In 320.49 driver u can enable SLI but when u start 3d programs like games a few sec later system crash

When you use optimized battery in leonovo energy management, then the system starting discharge your battery and after the battery reach 60% ur GPUs go up full speed. This is because the battery dosent have enough power for SLI at full speed.

NVIDIA GeForce GT 750M - NotebookCheck.net Tech vs NVIDIA GeForce GT 650M - NotebookCheck.net Tech Kepler core both. (Nvidia earlier used same chip in some product just rename it and voila new VGA)

Same core as the 650M just higher gpu clock and a bit faster ram, and same cooling.... Nothing special i think.

I see a video on Youtube a full disassembly guide. https://www.youtube.com/watch?v=dmVYvJhlhL8

Try it in P0 state (as i know in p0 the GPU get a little bit more volt).

My ultrabay gpu is 1, as all others y500, why do u think ur y500 is different?

I see u use 306 driver, 310.9 or older driver u don't need modding the bios!

Hi all somebody knows wats the difference in v1.05 and the v2.02 official BIOS? I have 1.05 official BIOS modding this, or worth it to upgrade to 2.02 and then mod...