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Definitely look at your RAM. In testing an extra DIMM I sold to another member here I ran into this: “Tested the DIMM out this evening to make sure it still worked and I was wrong about it working in the Dual banked slots it actually only works in the Single banked slot where it works as 32MB...

The Power Macintosh 6500/250 I picked up a while back on eBay seemed to work okay except it made a horribly loud grinding noise. I was sure it must be a bad power supply fan. But when I tried the logic board in a different 6400 chassis the sound went with the logic board, it seemed crazy but the...

For Mac Bench 4.0 I played with the QuadControl control panel "Quadra Boost" ROM in RAM setting, its seems the "MAX" setting (MQB below) provided some increased benefit with the FastCache Quadra over the default "Good" setting (GQB below) but not so much without the card installed.

And Norton System Info 3.21: \

Speedometer 4.02 results are interesting:

<sheepish grin> After removing all the VRAM SIMMs and testing adding 2 of the 6 expansion SIMMs back at a time they all checked out. That's got to be the mechanical contacts, but the 10% performance drop remained ....and then I saw your post. <forehead smack>. Thanks @jeremywork! Running...

On my Centris 650, clearing the PRAM made no difference, neither did deleting the QuadControl System Preference file that I found in another thread as a suggestion. Back on the Q700 doing some baselines in Norton System Info tests before putting the FastCache back in and I’m suddenly getting...

I don't think I tried clearing the PRAM, will try that tonight. I do think it could just be a quirk of memory timings or something specific to the 25MHz Centris 650, the other Wombat's that apple shipped are 33MHz. And as mentioned above the 1993 product data sheet leaves out the Centris 650...

It just came up when I manually checked an eBay saved search I have for "Daystar Digital". It was listed as "daystar digital 105013-109 33 Mhz Card 01-FC040-001", BIN $35. Super lucky timing I suppose as I'm sure lots of people have similar saved searches/alerts set up. Other then the printed...

Working on MacBench and Norton System Info results next...

I was fortunate enough to pick up a Daystar PowerCache Quadra and have just started to dig into it. I've long wondered if L2 Cache would improve performance on 68040 machines as much as it does for 68040 and PPC ones. From the above linked archived data sheet: FastCache Quadra 128K Static RAM...

Looking to source an LED for my Quadra 700 (and Iici)'s hard disk drive activity light, something period appropriate. From above it sounds like it is supposed to be an amber color? I'm not sure what the secret googlesse is to find this type of LED either.... Right now I'm thinking this might...

Victory! :)

I was thinking check the connector but then you said you swapped CPU cards. ...did you also also visually check the connector PINs? its not too hard to bend the ones on CPU card side when inserting and removing the RAM cards. would be odd if you accidentally did it to both but in the realm of...

I'm not sure I'd want to alter my SE/30 this much and maybe a crazy idea but what about replacing the CRT with a modern 10? inch LCD and driving it with the 30Video VGA output? I guess that would be no different from the 30Video's prospective then driving an external VGA monitor? i.e. the...

Does this So cool...

DM me with your address and I can get the shipping cost for you. Not sure how to tell, maybe ask the seller via eBay?