Overclocking the DC and where to get the Increase

**Morph** · November 13th, 2005, 19:32

Hey, back again, and I've gotten some work done. Thru some very precise coaxing, I have gotten my DC to hit 288Mhz. I still have not done a voltage mod. I was going to try what flaming carrot said, but I cannot find R133 to do it, the bottom of the DC motherboard is a gaggle of the little buggers. I've even found C133, but not R133.

Can anyone help?

EDIT: OH! btw, do you think that only an extra .02 volts (2.02V) can hit 300Mhz? This is being asked because the SH-4 can run at 2.5V max, and it is at 2.0V now. I was actually shooting for 2.2V.

EDIT2: OHH! Another idea! Is there any way we could try the "pencil trick"? Heres a link to an example: http://www.pcstats.com/articleview.cfm?articleID=953 Seems to work fine in that situation, whos to say it wont in this one?

**flaming_carrot** · November 14th, 2005, 11:25

I think you are looking on the wrong side of the board. R133 and R134 are on the same side as the SH4 and PowerVR chips, and pretty close to the SH4.

Here's from memory to give a rough idea:

.---------.
| powervr |
`---------'
.-----.
| SH4 |
`-----'

R133
R134

**semicolo** · November 14th, 2005, 18:46

This pencil trick won't last, you can make some tests with it, but be sure to use real resistors when you're happy with the settings you found.

**Morph** · November 14th, 2005, 22:54

Ok, I found it. I should be able to get a 4B pencil tomarrow, and I'll give it a whirl then. And yeah, I am not shooting for anything permanent at the moment. I am simply attempting if it can be done.

**ptr.exe** · November 22nd, 2005, 16:24

Hey morph, i havent been on this board for ages, good to see you're still making progress.

What did it take to hit 288Mhz?

**Morph** · November 28th, 2005, 04:57

I bought a bulk load of 40-50Mhz crystal oscillators, and I had like 4 different ones rated for 48Mhz. So I tried them all, and one was kinda wierd. It would boot the opening DC intro audio, but no video. I reset it a good 4-5 times, and it ran fine from there. WIIIEEEERD.

Also, I cannot find a 4B pencil for the life of me.

**ptr.exe** · November 28th, 2005, 15:55

That is odd, because I have the same thing when trying to OC one of my DC's to 276Mhz, sometimes i can hear audio but no video, sometimes there is video but it locks up after a few seconds.

Would you like to sell some 44Mhz C/O? pm me if you do.

**Cross** · August 17th, 2006, 19:51

Wow this is AWESOME!!! I wish I could have ever come back and said we found out something great but all the guys did in the shop was take it apart, play with it and then have it out during a walkthrough and it all got thrown away.....

Anyway I would REALLY like if you have any extra crystal oscillators if I could buy one from ya. Def been missing my DC and I just picked up another at a yard sale... black to hehe

**Morph** · August 17th, 2006, 22:46

Well, talk about dusting off an old topic. Ok, let me see what i can refresh:

I bought a ton of C.O.'s in bulk, and was willing to just hand them out. I knew people needed them. Well, low and behold, my temporary PC finally gives out. Then my next temp gives out to.

I've been without a decent PC this whole time (this thing is NOT decent). I sold off a lot of unecessarry stuff to get some new parts, and unfortunately, I got rid of my C.O.'s in the process.

My DevDreamcast turned into a flop. The custom GD cable snapped, and was pretty much a lost cause. I tried to borrow a 4B pencil from a friend of ours, but they didn't have one. I was not able to find one. Then, while working on my main DC, we got hit by a CRAZY power-surge, and my new test DC's power supply lit up like the 4th of July. Fire extinguisher required.

Well, I kind of gave this project the boot after that. I am satisfied with 288, and maybe someone else can do 300. I MIGHT try again in the future (picked up some REALLY low profile 486 heatsinks, that can fit under the heat-plate) but it won't be any time soon. I REALLY have too much I am working on.

**Cross** · August 18th, 2006, 00:16

Yeah I know I had to go away for awhile, lol new family member!

Its to bad to hear about your DC. I would have been happy to send you the 4B I am sure the shop had a few laying around they would not have noticed for a few weeks

But alas I am no longer at that station I am DONE! WWHHOOWWW

Anyay I guess I overlooked how old it was I just kinda came back to see what happened. *Shrug* ADHD what can I say

but with how much Good Info this thread has I don't think it was completely evil to dust it off