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Yes - the lower value is the core clock, the higher value is the memory clock. During gaming, the GPU (780M) can boost to 850MHz, and overclocking programs (Nvidia Inspector, MSI Afterburner, etc.) will add to that. So if you select +150 for the core, your final overclocked value will be 1000MHz. The same thing goes for the memory - normally it's clocked at 2500MHz (5000MHz effective), but if you add +500 using the same software, it will become 3000MHz (6000MHz final value). The same principle should apply to any other Kepler 6xxM or 7xxM series GPU that employs boost clocks.

I just had a chance to test the voltage sliders with the modded vbios (Clevo P150SM / GTX 780M), and I found that +150mv actually served as my "0" point of reference. In other words, here is what I found: +162.5mV translated to 1.025V (+12.5mV), and +175mV translated to 1.037V (+25mV). At these voltages, I was able to overclock to (1000MHz / 6000MHz) and (1025MHz / 6000MHz), respectively - so I was pretty happy with those results. At the higher overclock, the 3DMark11 graphics score was ~9600 (!). SVL7 - thank you so much for releasing this vbios, it's really great to see what the 780M can do.

Yes, that's right - overclocking mainly for benchmarks, just trying to figure out the GPU's performance. I think a lot of folks here love to tweak, and they just want to be as familiar as they can be with their GPU. Yes - for most games I don't feel the need to overclock, but it's nice to have that option for the really demanding ones.

Here is a link to the 240W PSU guide: HTWingNut's Sager NP8250 / Clevo P157SM Review - Page 5 Yes, I have the same handle on the NBR forums. By the way, the guide is specifically for the Clevo P150EM / P150SM series with a 2.5mm x 5.5mm connector, and so you'll need to adapt the instructions to whatever connector your laptop uses. I would also try to use at least 16AWG for the spliced cable.

Hi, thanks for the suggestion. I went ahead and applied a larger voltage increase (+75mV), but GPU-z still shows 1.012v under load. I can see that the core and memory slider increases are being applied, but so far voltage seems to stay the same. The modded bios is still great, though. I noticed that if I back down a lot on the memory (to just +100), I can get +150MHz stable on the core, which is something I couldn't do before.

I don't think it's necessarily a PSU problem, because right now I'm using a modified Dell/Delta 240W power supply. I read on NBR forums that the stock Clevo 180W PSU wasn't enough for the +135/+500 overclock, so I prepared a modified PSU (...and even took the chance to make a guide for it there). SVL7 - I'm using the WHQL 320.49 drivers. With regards to the voltage: if I tried something higher than +25mV, then the voltage increase might actually occur? If that's so, could I try something like +50mV or +75mV and then monitor the voltage in GPU-z under load to see if it's actually hitting 1.037v? I'm a little worried about applying anything greater than +50mV, do you think that would be OK?

Hi, I recently flashed my GTX 780M (Clevo P150SM) with the modded vbios, and it worked perfectly. It completely removed the +135 core limit which previously existed in MSI Afterburner. However, I found out that I couldn't go higher than that anyway. My max clocks with the stock vbios was +135 / +500, and after flashing with the modded vbios, it remained the same. At +140 core, I can't even complete the first benchmark in 3DMark11 without freezing, whereas I've used +135 core to complete numerous entire runs. I was hoping that a slight increase in voltage would stabilize higher core clocks. When I used Nvidia inspector to apply +25mV, it appears to show that the voltage has increased, but when I check GPU-z it still shows a max of 1.012v (i.e. stock values). I would love it if the voltage modifier worked - the 780M I have handles +135 without any problems, and I'm thinking it could probably go a little higher with slightly increased voltage. My old GTX 680M was flashed with a modded bios that increased voltage to 1.037v, and that GPU was able to run completely stable at 1050MHz on the core.

Also, from what I've read on other forums, the i7-3610qm even at stock settings should have absolutely no problem with the 7970M. I used to have the P150EM with GTX 680M, and everything ran smoothly, even when the GPU was highly overclocked via a vbios. The i7-3610qm shouldn't be a bottleneck in your system in any way,

I would second the Sager/Clevo models, mainly because they are highly customizable when you purchase from one of the reputable online PC builders (e.g. Mythlogic, XoticPC, etc.) The newer versions come with the i7 Haswell chips, and they have some 15.6" models with 1080p screens and either a GTX 765M or 770M, which are actually quite powerful. I just got a Clevo P150SM and it's really good. I've had good experiences with Dell/HP (...opinions really run the gamut with regards to pre-built laptops), but by I've been much happier by far with the Sager/Clevo models.

I've also found the GTX 660M to be pretty good for gaming at 720p at higher settings, and even 1080p at medium settings. I bought the HP DV6Tqe (i7-3610qm / GT 650M 2GB), and it runs most things pretty well. Even though it's a GT 650M, I had a sample that fortunately overclocked well (1100 MHz core / 5000 MHz memory), so it's essentially like a GTX 660M since they're based on the same chip. I was also thinking about getting the Lenovo (heard good things about them from friends), but the HP I purchased has similar hardware specs, and I can say it's really good for moderate gaming. You can't go crazy with the settings, but really - there's hardly any game it can't play as long as you reduce settings reasonably.

I also recently purchased a P150SM, and the fan levels are pretty much the same as on my previous P150EM (Low speeds when browsing or using office programs - noticeable, but not too bad. And silent when there's no load.). I did read on NBR forums that some versions of the new P150SM, P157SM, and other related laptops had really loud fan behavior, but that it could be corrected with a BIOS fix. My laptop came from Mythlogic, and it was delayed because they wrote saying they had to do some tweaking. I'm thinking that they installed a newer version of the motherboard BIOS, because the fan behavior is pretty normal. I haven't checked yet, but perhaps Clevo will upload a new BIOS for the new P15xM series to their official support website, and maybe that will help.

Hi, I also recently made a modded 240W PSU for the Clevo P150SM (Haswell successor to theP150EM), both of which use the same 2.5mm x 5.5 mm barrel connector. I had also posted a guide for making one in the NBR forums: HTWingNut's Sager NP8250 / Clevo P157SM Review - Page 5 The stock 180W Clevo power supply does not provide enough power for overclocking the GTX 780M (e.g. MSI Afterburner overclock at 980MHz / 6000 MHz). You can easily see stuttering in games and benchmarks. However, with the modded 240W power supply, everything works fine. After reading this thread, I saw that there might be some limits with the modded power supply? I see readings of up to ~210W when I use my modded PSU with the overclocked 780M, but I think that's because of how much power it's really drawing, and if I overclocked more (which I can't since I don't have a custom vbios yet), I'm assuming it will draw more power. If a PSU says 240W, does that mean it's the actual limit, or can it give slightly more? I know that high quality desktop PSU's (e.g. Corsair, Seasonic, etc.) are "rated" for a particular wattage, but can give more if stressed. Not that you should do that, anyway, but can mobile PSU's do the same?

The GTX 660M is basically the same chip as the GTX 650 (384 CUDA cores, non-Ti version), and it's approximately half as fast as the GTX 570: MSI GeForce GTX 650 Power Edition OC 1 GB Review | techPowerUp. However, if you lower the resolution the GTX 660M is pretty serviceable for gaming. Buy as long as mobility is not important to you, the desktop GTX 570 is absolutely the better choice of GPU. Depending on how well it overclocks, it's also well known that the GTX 570 can get close to the GTX 580, which was a flagship card from a few years ago.