unstable

Flashing ES vbios without header works fine and it boots into windows with no issues. However, modified versions of ES vbios without header have same error with code 43 and same reports in GPU-Z as with header. So that means header is not an issue here. I'll try to research it further, maybe something will pop up.

Thanks for the link. I was trying to parse it on my own. For now I went back to the ES vbios and edit it with the Mobile Pascal TDP Tweaker. I flash it with external programmer. However, no matter how small the modification, nvidia drivers seem to reject GPU with error code 43 in device manager. I tried disabling driver signature enforcment but nothing changed. GPU-Z reports bunch of fields as Unknown, Memory size is 0, clocks are also 0. I'll include the screenshots. I suspect this is some nvidia vbios signature validation issue, but Mobile Pascal TDP Tweaker says both ES vbios and modified vbios have the same checksum.

Yes, sorry for not sharing enough details. I have LVDS display with optimus enabled. GPU is working through optimus. seems like imac vbios only disables HDMI since after further testing displayport on laptop seem to function just fine. I am currently running linux. Windows 10 can not boot with imac vbios, just like the other vbios except the ES. I did manage to boot windows 7 but nvidia driver setup keeps complaining about windows 7 being not supported even though I specifically downloaded old version that suppose to. Maybe my windows 7 is too old and I have to update it. So for now, until I get windows 7 updated, I can only test on linux. I tested GPU with the plain ES vbios. It worked fine and performance seemed reasonable. After I tried imac vbios and performance got noticable better, and card was stable. The only notable issue is HDMI not working and inability to boot to windows 10. After I tried enabling adjustable power bar and set max TDP from 115w to 150w on imac vbios. After this If I set from software TDP limit to more then 100W performance starts to degrade. I tested this with couple games and unigine superposition benchmark. Unfortunatly linux doesn't have GPU-Z, so what I am planning to do is get windows 7 to work and monitor the card there with GPU-Z. EDIT: Ok, apparently the only reason Windows 7 booted at all was because vbios got corrupted. ES vbios is still the only one that lets you boot into windows. On windows 7 when any other vbios is installed windows complains about BIOS not being ACPI compliant. Right now I am trying to make modified vbios on my own using ES vbios as base.

@JadeRover thanks for the help! GPU did post before, its just it doesn't work in the OS, drivers can't detect them. I tried your method with removing header, using early engineering vbios as base, but windows still refused to boot and linux drivers complained about vbios. I modified the vbios I found in macrumors forum using mobile pascal tdp tweaker to set max TDP to 150W with power slider set to adjustable. I don't experience thermal throttle, core and memory frequencies were at max and stable but performance got significantly worse. I tried limiting TDP to 100W via nvidia-smi software utility without reflashing the gpu and it got better, but seems like setting max TDP to more then 100W causes performance to get worse. vbios before my modification had 115W max TDP and performed better compared to if I set max TDP to 115W through nvidia-smi when card is flashed with my modified vbios. Am I missing something? maybe something else needed to be changed in the vbios? I will upload my vbios as well as link the one I used as base if anyone is willing to take a look. vbios I used as base: https://forums.macrumors.com/attachments/p5000_r1-bin-zip.2084769/ p5000_R1_oc1.bin

Thanks for the link but I already have that version of nvflash and also ch341a programmer. Mobile pascal tdp tweaker generated vbios that every version of nvflash refused to flash to the gpu, so I used ch341a and programmed it directly but card stopped reaponding. After I did find quadro p5000 oc vbios I was looking for here: https://forums.macrumors.com/threads/imac-2011-maxwell-and-pascal-gpu-upgrade.2300989/page-19?post=31573011#post-31573011 The only issues are that windows refuses to boot since this is based on newer vbios version then the early engineering sample and hdmi and displayport outputs do not work. HDMI does nothing at all, while DP is very unstable. I will probably look into the oc vbios, stock vbios and early engineering vbios in hex editor, maybe I'll figure something out. It's not a big deal for me if windows doesn't work so I might just fix the display outputs for now.

Hello, I got my hands on quadro p5000m for my m6700. Flashed early engineering sample vbios to make it work with windows. I want to increase TDP of the card and/or unlock memory and code frequencies so I used mobile pascal tdp tweaker, but modified vbios made card unusable. I was wondering if there is any modified vbios for p5000 like there is for p3000 and p4000 for higher TDP or core/memory clocks?

I found a good deal for Quadro P4200. Maybe there's any chance to get it working with M6700? It's HP one so BIOS chip is missing but can be soldered on and flashed. Maybe i should start experimenting with it unless it has already been deemed impossible to work?

Thanks for all the info. P4000 looks pretty good both by price and performance and I also have an external flasher with a clip so should be easy enough. Also, I see @TheQuentincc had 2133mhz RAM working with M6700. I tried flashing XMP with Thaiphoon but even when setting XMP timings to stock, laptop just refused to post and diagnostic leds weren't working either. I have I7-3940XM and 4x8GB DDR3L Hynix sticks so I wanted to OC them to at least 1866MHz. I was also wondering if there's a chance for M6700 to use something more powerful than a 240W adapter (like a 330W Alienware adapter). I have read in forums before that the laptop recognizes a 330W adapter but refuses to use more than 240W. Was there ever found a workaround for that? Edit: Yeah apparently i was looking at the desktop version of P4000 and was impressed how good it was until i realised it wasn't mobile one 😅. Yeah... prices on those on eBay are quite high for being little more powerful than Tesla M6 which i got for dirt cheap.

Damn... That's a shame. I was concidering quadro p5000 but slower memory and double the price doesn't make it much appealing aspecially if it also has stability issues. I currently have tesla m6 with OC but since it lacks any video outputs and only works with optimus i can't use it with eDP display. Are there no other gpus with comparable performance that will work?

Hello, are there any progress with M6700 and gtx 1070? I was planning on buying one with eDP 3D panel. Also has anyone tested if it's possible to use both lvds and edp connectors at the same time for dual internal display?