Junra

Not sure if this is relevant for you since you've got fairly low GPU temps, but I've found that with the 750m on my y500, lowering the memory clock had little to no impact on framerates (I dropped the memory clock by 502 mhz and I lost 1 frame per second on Shadow of Mordor ), but it lowered by temps by around 10 degrees Celsius. Maybe that'd help a bit?

I guess I'll just keep on hoping that a mainstream manufacturer will release something like this without a proprietary cable someday. I've been wanting to get an ultrabay 750m for my y400, but apparently they don't sell those in India :/

I can go up to 90 here, matte display y500. Have to dial down the settings a bit but Borderlands The Pre Sequel is...well, I thought 60 was smooth. Then happened

The 768p panel, even if you discount the resolution, has horrible viewing angles and contrast. On a y400 here with the 768p display. Blacks are....well, they're grey :/ It sucks when you're trying to play The Evil Within because it's all...like dark grey. Even if you're running a single 750m, you could still hopefully get better contrast with that FHD panel

Without using Precision X to regulate temps, I used to get 80-85 while gaming (Y500, single 750m). It's not ideal, but I found a combination of methods that works for me and has brought my temps down to around 68. I set the max temp to 70ish in Precision X. Then, I enable framelimiting. For games that usually hover in the 30s (Shadow of Mordor, Far Cry 3 etc), I set a 30 FPS limit. Along with this, I underclock the VRAM. Did a bit of testing (used the built-in benchmark for Shadow of Mordor). At least with that and a few other games, a 500 mhz VRAM underclock--with Precision X--resulted in a 1-2 FPS drop, which is nothing. But my temps have never gone above 70. I'm running this with core +135