Overclocking the CPU on the p7805u

Hello everyone, I was wondering if anyone managed to overclock the CPU on this fine machine. I am currently overclocking the GPU to core 750mhz, mem 950, shader 1500 and run perfectly well in range 54-63 degrees. I keep my laptop cool by lifting it slightly from the desk surface using two small objects to hold it up about 2 inches. I run GTA IV great at about 30 fps but since it is very dependant on CPU, I wanted to see if I could clock that a bit as well since I am experiencing good temperatures and good stability with GPU clocking.

 

try 750/1050/1700 for the gpu clocks, if not 725/1050/1700, those should yield more performance, albeit slightly higher temps.
as for overclocking the cpu, all i could find is this pll:

ICS9LPRS365

try downloading set fsb using that pll

http://www13.plala.or.jp/setfsb/

it may or may not work

 

uhhh I believe the CPU is not OC'able.

 

hey, thanks for the quick reply. I think that the GPU overclocking is a bit too high at 1050/1700 because when I tried raising higher than 950/1600 I got graphical errors and sometimes crashes, regardless of temperature. And for the CPU OC I guess I could try this set fsb program, txs for the tip and I am still open to any other suggestions from people

 

Buy a super bad core 2 extreme and overclock.

 

i believe you cant do that on the 78xx series... no over clock whatsoever =/

 

You can overclock a multiplier unlocked X series cpu, but only to 3ghz, which means basically not at all except on the old x7800, and still not much even on that cpu. There's no FSB overclocking because the TME (trusted mode enable) switch on the clock generator is triggered. If someone can come up with a way to bypass the TME either via hardware modification or perhaps BIOS modification if it's controlled via the BIOS or the like then it'd be a different story.

 

I worked with abo, the setfsb author, to add HP 2510P ICS 9LPRS355BGLF PLL to his software. Required getting the datasheet from IDT by emailing them (eg: engineering student), then sending abo the datasheet and a few screenshots of the Diagnosis window from the setfsb command with the SMBUS read/write set to "Diagnosis" if it froze. When the software read the registers OK and I checked the datasheet, I found it was being reported as TME mode, meaning no overclocking (byte 9, bit , bit 6=0) I thought that was the end of it. However, come a few days later he provided a setfsb that worked OK with it. Don't know how he did it..other than it looks like he changed clock sources Byte 0, bit 2, from PLL1 to PLL3, by setting it to be logic 1. You can see how the registers are being set with this comparative image.

Also, can see that the TME mode can be disabled with the right logic on the TME pin. See relevant discussion here including a link to the hardware mod to do it. Might be worth giving the 9LPRS355BGLF a go and see if it works? Model is not far from the 365 version, so probably similar config registers being used. Also, at least with 2510P PLL, it appears the FSLa/FSLb/FSLc pins might be able to be set do hardware overclocking (100/133/166/233/266/333/400 FSB). The stock setting being 133. So 166 would be a goer. It would actually be a better way to go, as would be transparent to the user, and I assume the RAM timings would automatically accomodate the higher frequency operation. The datasheet is a little vague on that and I'm not keen to touch a warrantied system with a soldering iron to confirm. Perhaps others are?

 

Thanks for the detailed reply. I have read through this many times, and I went for the set fsb option. I went on the website downloaded set fsb, but when I click on the .exe it loads for a couple of seconds then nothing happens. I am running on vista x64, would that be the problem?
edit- Nevermind, it says in the readme that it uses signed drivers so it should have no problems with x64.

 

and as with the gpu clocks i posted, make sure your core clock is not running higher than what i had it posted at. core clock bottlenecks all the others really heavily.
and did the overclocking work?

 

Ok, I have gotten SetFSB to start, and used the PLL that was recommended. I don't see the value 133 FSB anywhere so I don't want to touch anything as this is my first time tinkering around with CPU clocking. I have clocked my GPU but this is definitely more complicated. I have uploaded my setFSB window so I may receive some assistance on what step to take next.

 

Several people have worked with him on the 365, and every report I've seen was he came back and said sorry doesn't work? I've read the datasheet and was aware of the TME enable pin, but not nearly interested enough to mod the laptop without at least having some idea where the TME enable source comes from, there's a resistor or diode that I suspect may tie in the TME line to the pin (it also acts as a pci clock line) but I'm not willing to, or have the time to tear the notebook all apart to try and map a couple traces out by eyeball to figure it out. Assuming I'm right about the resistor you could pop it with tweezers and a heat gun probably... So unless someone's braver than us I guess we're stuck, lol.

 

Perhaps changing MMT to TME, or clicking on GetFSB.

 

I clicked on GetFSB to get the picture displayed above, at this point am I supposed to increase the 379/760 number to a greater number to overclock? What number should I raise it to?

 

Move the top slider of setfsb to the right such that the FSB number increases by say 5%. That is quite a conservative overclock. Then click "Set FSB". It will either freeze, do nothing, or show an increase in CPU speed. The desired result is an increase in CPU speed.

To 100% confirm that you have had an increase in CPU speed, download and run CPU-Z and see what speed it tells you.

 

I have tried raising by 5% exactly to 398, and it simply froze windows completely. I suppose this PLL is not the right one or it's simply the bios locking it up...

 

I do not understand how it becomes 398. Anyway, the *top* slider is the FSB, the bottom is for the PCI-E. The idea is to try a very small increase on the FSB and see if the system accepts it. The top slider may say 266 or 133. Idea is to move it up say to to 271 or 140 (eg: 2%), then click "set fsb". See how the system responds. If it is still active, then use CPU-Z to confirm the overclock worked. Then is just a matter of incremental increases to determine the limits of overclocking.

 

I was referring to the value shown on the bottom slider in the picture attached in one of my earlier posts. Aniway, I went ahead and moved the top slider instead and still my computer froze immediately. Guess that I gotta wait for some bios update to be able to OC the CPU.

 

Yes I did OC my GPU to 750/955/1900 and it runs EXTREMELY smooth on every game. I get temps around 68-70 degrees after half an hour of play, but this problem will soon be fixed by my new cooling pad coming in :_)