Overclock 720 - redline?

Anyone here overclocking their 720? How far have you pushed it? Is the difference noticeable in everyday use ? What benefits most from the increase?

I'm not worried about shorter battery life, but I am concerned about stressing parts into failure.

Is there noticeable heating of the 720? Funny smells? They're the first signs of troubles to come.

yeah i tried it both on my 720 (now 728 ) and 728, the 720 liked 221 mhz better, i almost thought my cf card was going to get corrupted at 236 (cant remember how or why, but somehow the 720 wanted to screwed it up )
728 tolerated 236 mhz much better as it worked perfectly but wouldnt sync with AS at 221

236 is the most you can overclock the sa1110 to.

i experienced no real adverse effects otherwise, but didnt try this for a prolonged time as i didnt see so much improved performance that would have been worth it (i was worrie about battery life). i did benchmarks in betaplayer (it wasnt called tcpmp at that time ) and it was maybe a 10% increase in the bitrate. but going into the Windows dir was noticeably faster

a friend of mine was using a simpad sl4 constantly with overclocked cpu (yes to the max, 236)

I don't know, just up to 236 from 206 MHz hardly seems worth it.

Edited by CE Geek 2006-01-25 12:18 AM

Well, it looks like the SA scales with speed. So a 10% increase in clock might get you 15-20% in benchmarks. I'll give it a spin and see. If I see any flakiness, AS or otherwise it's back to stock.

How about mips? I've never seen any way to overclock a mips except to modify things, like the pencil trick. I dearly wish there was a way to software tweak a mips.

whats the pencil trick?

about benchmarking, rothberger has benchmarks with overclocked jornadas

720: 382 -> 404 -> 449 (6%, 18%)
728: 402 -> 427 -> 456 (6%, 13%)

btw can you submit the nec 790's benchmark results?

With some mips you can use a pencil to create a carbon bridge between certain solder points interally to increase the clock speed. I have never heard of anyone finding the points inside a MP series, just some Casios.

I can add the mp 890 to rotherberger. It's the same results (within a point or two) as the 790. The 781 now has the same results as the 880.

IMO, that proves that ce 2.11 is badly written as hpc2k yeilds much better results on the exact same platforms.

would be really nice if you could add the 890! i've just received my 790 rom (finally ) and i'll do the 790 benchmarks if the rom works in my 780

(no worries i won't abandon ce 2.11 mips, i'm gettign a 770 as thats cheap and i never saw a 770 before anyway! )

MS can improve things sometimes after all eh?

Yes, and MS can foul it up just as fast. Isn't the SL4 cenet benchmark low compared to say the 720 at normal speed?

benchmarks are strange sometimes. the mp900 with hpc2000 scored much better (i did the benchmark that can be found on rothberger) than with cenet (yes i rechecked it!) and it is faster with cenet.. usually the benchmarks are telling but not always.

I OC'd my E-125 (Mips) to 206MHz from 168MHz and definitly noticed an improvement in NES Emulation, even though the OC was only about 15%. And, might I add, it IS quite easy on the MIPS!

Is the Jornada 820 Overclockable?? I wish it could emulate like my E-125 ;-)

Hi guys,

I got a Sigmarion III equiped with an Intel PXA 255 @ 400 MHz. I used an overclocking tool to speed it up to the limit the softwared allowed: 800 MHz!!! - And the Sigmarion survived.
Unfortunatly I didn't do a benchmark. But the felt performance was nearly the same, since the graphics driver and the gui style is the bottle neck of this machine.

But interesting is also the underclocking! You can slow done the Sig III to about 160 MHz and still listen to mp3's while writing a text. This saves much power and gives you up to 25 % more operation time. Especially usefull, when you are in a meeting and the battery is allready low. *bg*

800mhz! Wow!

You should try it again and benchmark it. The results will be through the roof. I like the underclocking info. I u/c'd my E200 all the time when the battey was getting low. It really stretched out the life. It wouldn't o/c, it would always lock.

Again, like the flash rom issues I mentioned in another thread, I sure someone with the proper skills could find a way to o/c a mips mildly. Since the Sig ii is mips @200mhz it would be nice to push 790/880 necs to the same speed.

And of course, I wonder how far the 6651 could be pushed? It's so zippy for a 129mhz machine it could only get better @168mhz (if it could go that far)

Anyway, I'm waiting for my my 2nd 720 to arrive. I'll play with o/cing when it arrives.

they're not the same MIPS version, the 6651 and the 790 (with the 168 mhz).

dunno about sig II

but OC should be possible really..

Yea, I realize they're 39xx and 4xxx cpus. But how different really are the cores? They can't be too different.

Somewhere out there is a 300mhz mips embedded in a consumer device. I found this while googling a while back. It's a real stretch to imagine that mips is pin compatible with any hpc, let alone the timing and whatnot would be suitable.

Sigh, this is when I pipedream of having the tools and knowledge to try transplants " just to see." There's so many possibilities to check out and not enough resources.

there1re 500 mhz mips'es too