Where can I get 40mhz crystals from?

Dr. Jigglin · Nov 7, 2006

I want to overclock my Dreamcast so I can play Shenmue 2 without the massive lag but I need a 40mhz crystal to do so and the closest I've been able to source are 20mhz ones.

werejag · Nov 7, 2006

how many you need? if one i might have a old one on a dead pcb

taitai · Nov 7, 2006

make a 40 mHz Monostable Multivibrator?

68k · Nov 7, 2006

You don't neccessarily need a *40* MHz crystal, just something higher than 33.3 MHz, and probably less than 48 to keep the overclock within reason.

I usually scrap mine from old PCBs, but you can also get some on Ebay and Digikey.com

EDIT: Make sure you have a revision 0, or 1 Dreamcast.

Dr. Jigglin · Nov 7, 2006

Yes my Dreamcast is revision 1.
Well yeah all I need is something between that area but 40mhz looks like a stable clock keeping in mind the dc's shotty cooling system.

Werejag, I only need one.

68k · Nov 7, 2006

The Dreamcast has plenty of cooling capabilities for any type of overclock that the CPU can withstand.

Which guide are you using to overclock it BTW?

Fakk2 · Nov 7, 2006

WTF!?? Are you saying the Dreamcast has only a 33 Mhz CPU in it!?? I thought it ran far faster than that? I was under the impression it had like a 200Mhz CPU.

68k · Nov 7, 2006

It does run at 200 MHz (or 198 to be exact), but the bus speed is 33 MHz. The CPU multiplies the bus speed by 6 and the product is the CPU's core operating speed.

33.3 x 6 = 198

werejag · Nov 7, 2006

lachlan said:
Yes my Dreamcast is revision 1.
Well yeah all I need is something between that area but 40mhz looks like a stable clock keeping in mind the dc's shotty cooling system.

Werejag, I only need one.

ill see what i have.

if i have tell me your address via pm and ill drop in an envelope

Fakk2 · Nov 7, 2006

68HC000 said:
It does run at 200 MHz (or 198 to be exact), but the bus speed is 33 MHz. The CPU multiplies the bus speed by 6 and the product is the CPU's core operating speed.

33.3 x 6 = 198

Oh thats neat to know.

Dr. Jigglin · Nov 8, 2006

68HC000 said:
The Dreamcast has plenty of cooling capabilities for any type of overclock that the CPU can withstand.

Which guide are you using to overclock it BTW?

The guide? I saw it somewhere on the net, every guide is pretty much the same as you're doing the same thing, feeding a different mhz frequency into the cpu where it multiplies it internally.

The dreamcast has shotty cooling and isn't going to be awesome for anything higher than 240mhz for very long periods of time.
I don't have a DC with a heatpipe cooling solution, just thermalpaste and a metal plate with a small fan trying to generate airflow.

I have a spare DC rev 1 board that I will be using to test things out and then I will transfer it over to my full DC.

werejag said:
ill see what i have.

if i have tell me your address via pm and ill drop in an envelope

Awesome man, much appreciated.

68k · Nov 8, 2006

I wrote the original guide, thats why I was asking.

I've tested every aspect of overclocking the DC and everything cools properly even at 270 MHz.

werejag · Nov 12, 2006

i havent forgot lachlan about looking. so far i have yet to find one for you

Witchboard · Nov 13, 2006

Hit up www.jameco.com and see if they have what you're looking for. You can start here.

Where can I get 40mhz crystals from?

Dr. Jigglin

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