BVision overclocking !?

[AmigaMance]

http://xoomer.virgilio.it/giorsign/bvision.html

  When i read it for the first time, i thought that it was a joke. Just look at the tooltypes and you will understand why.
 Well, i follow the instructions and i can say it works! I wonder why such a great feature is being kept "secret"...
Using google and the tooltypes as keywords, i only found 3 sites referring to this trick.
 Why? Because of the overheating/stability problems that may arise if you set the MELTDOWN argument too high, or are there more problems with this?

 I was able to overclock it at 88 Mhz max. without any  stability problems. (I haven't test it extensively, though)
 Anything greater than 88 makes all the games/demos that uses 3D acceleration to crash after a few seconds.
 At 90 Mhz and greater they crash (freeze to be precise) almost instantly.
 Non-3D accelerated software isn't affected much by higher numbers.

 I have a heatsink/fan attached on the permedia 2 chip.
 I'm curious to find out what kind of overclocking other ppl have achieve. So, feel free to post your expiriences along with the way that you cool down your BVision.

[Piru]

I wonder why such a great feature is being kept "secret"...

It's not. It's common knowlege, or at least was few years ago.

I'm curious to find out what kind of overclocking other ppl have achieve.

I managed to get 96 (always stable), or 97 (sometimes unstable). I had a heatsink + fan from GeForce card. The BVisionPPC board was a Phase5 one.

[Robert17]

I'm curious, I have a CvisionPPC, what kind of speed increases in say,3d games can be achieved from overclocking the card?

I remember from my PC days that sometimes overclocking can give little speedup.

Robert

[MuLTiViEW]

 It sure is good seeing people overclocking!

 overclock those bourds now !!!!!!!


 GO GO GO GO GO GO GO GO !!!!

  :-D

[AmigaMance]

@piru
Wow, always stable at 96! Now i wonder why i can't push it above 88 without losing stability.

 
 @Robert17
"I'm curious, I have a CvisionPPC, what kind of speed increases in say,3d games can be achieved from overclocking"
  I haven't done any speed tests, but there is a little benchmark at the bottom of the url that i've post.


 Btw, how the heck can i quote in here?

[Robert17]

Mmkay I might have a bash at overclocking my CvisionPPC, where can I get the pre7 patch for CGX4 though? I managed to get rc5 from somewhere.

Better go buy me an active heatsink then, it's only got a passive on it currently

[AmigaMance]

 I don't know about that version. I'm using rc5 too.

[BadBigBen]

Btw, how the heck can i quote in here?

by using the QUOTE button or encasing the quotable text in {quote} TEXT {/quote}, replace "{" with "[" and "}" with "]"...

[delshay]

i once read somewhere on a website that the PERMEDIA 2 chip has been overclocked @ 120MHZ..


my bvision is overclocked with a **new** osc from 14.3mhz to 15.2mhz..

overclocking via the tooltype should not give u lock-ups..
at lease not on my set-up..

i can type in anything i like..

ie..if i type in MELTDOWN=170 or even 200 3d software will just go slower..no lock-ups

the best result for my set-up is something between 98 & 110,but im not useing this at the moment as my bvision is overclock with a new osc..

[Piru]

ie..if i type in MELTDOWN=170 or even 200 3d software will just go slower..no lock-ups

The value is limited to max 100.

[delshay]

@ PIRU


that explains why anything as high as 200 everything slows down..


but i do not get lock-ups..

[Framiga]

do you have an active cooling on the Permedia?

I don't get lockup but some GFX corruption above 95 Mhz (CVPPC active cooling)

[AmigaMance]

by using the QUOTE button or encasing the quotable text in {quote} TEXT {/quote}, replace "{" with "[" and "}" with

 Thank you for the info BadBigBen. I have try the quote button in the past but it doesn't do anything, both in Aweb and ibrowse. But as you can see the syntax works.

[AmigaMance]

overclocking via the tooltype should not give u lock-ups..
at lease not on my set-up..

i can type in anything i like..

ie..if i type in MELTDOWN=170 or even 200 3d software will just go slower..no lock-ups

 Sorry, but you are completely wrong (well at least in my case). As i said, values above 89 causes 3D accelarated software to crash.

[delshay]

@ FRAMIGA

i have the following on my BVISION..

1x socket ( for changeing osc )

4x thermaltake heatsink on BVISION ram..copper

the other chips including PERMEDIA 2 has standard heatsink..no fans..( A1200 in desktop case cooled by three main fans..

NOTE: you must cool the other chips as well..

**ALL** heatsink have a wire sent to earth..

this not only reduce noise when useing prelude sound card but also inproves image...

if you get GFX corruption ( when overclocking ) it may be down power..as my BVISION has no regulator & is powered direct from powersupply..


BVISION is 3.3v..& i think CVPPC will be the same..