Which is better, BVision PPC or Voodoo3 ?

[delshay]

cv643d wrote:
Orange: I was thinking of running double cables or even a single TP-cable for every signal comming from BVision.

Vulture wrote:
Actually, while BvisionPPC *maybe* a little bit faster on desktop and video playback than a Voodoo on Mediator with 8mb window set, on anything warp3d Voodoo is much faster. And thanks to Voodoo's 16mb compared to Bvsion's 8mb, you have more space for opened screens.

While that might be true (which I have no reason not to believe)on most things on the desktop that moves, it is much faster on the BVision and sometimes slower than AGA on the Voodoo. For example EaglePlayer/Deliplayer graphic visualisers, scrolling in browsers etc, running a big shell screen you can notice that when scrolling large chunks of text. I dont remember the issues in detail anymore because I sold my Mediator so soon. But there were some topics about these issues on the Mediator mailing list without no known solution.

the Bvision can be improved with a faster bus speed. during testing i found dual 67.666Mhz fitted to the Blizzard PPC seems to work better than say 68Mhz ( overclocked 240Mhz PPC )

there a clear improvment in 3d perfomance. to get this you also need to go to the Blizzard PPC Ram menu & switch all to *no precharge*

WARNING: with faster OSC & the memory switch in that mode you can damage you simms or your Blizzard PPC card if you dont have the right cooling.

four microchips on the Blizzard PPC needs cooling.

test done with OS3.9

[delshay]

Vulture wrote:
@delshay

"four microchips on the Blizzard PPC needs cooling."



Which ones? I mean, obviously the PPC and 68k (no?), what others need cooling?

the microchips have the marking CY7C3741 there are three of them.

some amiga users use a washer on the microchip under the Blizzard PPC heatsink with thermal paste.

WARNING: if anyone trys the above you must check the washer is not to thick or to thin.

if to thick it will reduce contact with the PPC chip.

if to thin will not make contact with PPC heatsink.

the SCSI chip also needs a heatsink if Blizzard PPC is Overclocked.

temperature of the CY7C3741 near the Bvision socket is higher than the other CY7C3741 around 54-58c ( not overclocked ) if i remember.

the mach microchip ( also near the Bvision socket ) is also around the same temperature and also needs a heatsink.

***VERY IMPORTANT NOTE***

if adding a heatsink near the Bvision socket it best to check/do this with Bvision & possibley SIMMS added.

if you add heatsink without checking Bvision/Simms you will not be able to fit them after.

*** check Bvision/SIMMS will fit before adding heatsink near Bvision socket ***  

[delshay]

orange wrote:
there is a similar thread with nice photos on amigaworld (sorry if breaking rules)

I remember seeing BPPC with yellow heatsinks on those tiny chips somewhere (probably here) but cannot find the damn link.

that link shows a heatsink glued to a PPC processor.

i would have fitted the fan the other way as to blow hot air away from PPC card & motherboard.  

[delshay]

cv643d Quote:

About cooling the BPPC, I would not remove that black heatsink and replace it with a single cooler over the PPC-chip because the original heatsink was meant to cool the chips on the side of the PPC. You will need some kind of airflow over these small chips if you remove it and if you study the original heatsink you see that it has a channel where air flow over the chips but only has contact with the PPC.
 
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i can't see how it going to cool down any microchips.

the channel on the Blizzard PPC heatsink is more likely to cool down the two regulators.

so a single cooler over the PPC processor *maybe* better as you can add your own cooling to the regulators ( if needed )