Can you post a picture of that board?

maxtherabbit wrote on 2022-05-08, 18:58:

Can you post a picture of that board?

I can not now. Plain LS-486E rev.C1

led178 wrote on 2022-05-08, 19:06:

maxtherabbit wrote on 2022-05-08, 18:58:

Can you post a picture of that board?

I can not now. Plain LS-486E rev.C1

I must have misunderstood your original post. By "module" I thought you meant something physical, but I'm assuming now you meant an Award BIOS "module"

Been trying to locate a specific AVC fan model.
Managed to locate few of them.
All parameters on the stickers match except the one on the right.
What that is ? An air flow/displacement metric ?
Tried to search online but didn't find anything that clarifies it.
Any hints ?

Used 4 random pictures i found online for reference.
Circled the numbers in question.

Couldn't that easily be a code for production batch?

I have two fans here with numbers -134 and -137.
Unlikely to be a versioning of sort.

Not this, The actual model numbers has codes that signify, bearing type; CFM and rpm, voltage and thickness and width size.

DS0825B12U:

DS series
0 ?
80 80mm
25 25mm
B ball bearing
12 12V
U high rpm (have to look this up in their catalog.

Cheers,

I figured most of the parameters in the model string except B and U, so thanks for the description.

I had 2 of these fans. They looked very similar, both had the same dimensions, voltage and amperage.
One of them produced much more airflow than the other.
The only difference between them was that string on the middle-right side.
The more powerful fan broke recently.
Couldn't find the exact model online so started looking for clues.
Their price is surprisingly high for what they are which was motivating factor for looking this up.

AVC is okay but there is much more out there these days, these are the good ones:

Nidec
NMB
Sanyo/San Ace
YS Tech

Subpar grades:
Delta
Sunon

And any odd ball brands are generics and are junk.

Cheers,

What about Panaflo?

I am a bit ignorant about fans.
Have bunch of them in a box.
Cannot remember any of their history.
The one that worked well was that AVC - so went for the same after it died.

Thanks for the brand names. That's great. Going to expand the search criteria.

Just curious other than being loud and kinda pricey what's wrong with Delta fans?

Panaflo is also excellent but hard to get one in PWM if one wants this feature.

Cheers,

Delta has motor and plastic molding quality issues, bearing is kinda funny, generally motor magetic impluses noisy even on low and also too often out of balance makes these noisy. And commonly fakes.

Cheers,

Looks like you are knowledgeable about that stuff.
Can you recommend a slim 50mm fan that is quiet yet produces large airflow ?

Nope. Unless you are very specific about heatsink size, I rather go to another 60mm fan on heatsink, from there you can have thicker fan and run it slower for more quieter, yet decent enough on flow and cooling needs. Otherwise find another with 80mm fan if you can.

50mm is not that common actually on selection of fans out there. 15mm and 20mm thick of these 5omm fans will and be always noisy and poor flow.

Cheers,

I have a specific 50mm heatsink requirement.
Thanks for the notes tho - they helped me narrow the search a lot.

---

@Feipoa

Tested the 1024Kb L2 cache module for Pc-Chips M919.
Quite a surprise there.
Details here but in general - with bigger L2 cache buffer M919 becomes the best performer at 180MHz (3x60) i have seen so far.
Unstable at 200MHz.
Good-to-ok at 160MHz.

I've been playing around with the m919 v3.4 and a Cyrix 5x86-120 w/1024K and VLB graphics. Seems like PCI graphics are a bit more stable. Have you run any comparison here? Also, did you test 1024K w/128 MB for stability?

Didnt notice any stability difference between S3 Trio64 vlb, MGA pci.
Any particular graphics card giving you trouble ?

Tried 128mb ram - works well, but selected modules are needed for tightest bios timings.
I test with period correct-ish software so it is not like i can load that much ram for good.
Even 3d rendering and VC++ compile cannot exceed 64mb. Well, not even 40mb really.
I can probably grab some heavy CAD or 3d set ...
What do you test with ?

This board exhibit the same behavior i noticed with VLI - more cpus work at 180/200 mhz.
In fact i can run some of them at 200mhz at 3.3v with weak Peltier (5v). Kind of crazy.

I've been testing with these VLB cards: Trio64V+, Mach64, GD-5428, and Virge. I'm using an Acer Magic S23A ISA sound card and have noticed that in DOS Quake or WIN Quake, if I have sound enabled, I will see occasional colour goofs during the timedemo (w/Trio64V+). Those colour goofs become a lot more frequent with the Mach64 VLB or GD-5428 VLB. If I use the -nosound flag when loading Quake, there aren't any colour goofs. I'm guessing that this is one of those PC Chips features, or maybe there is some particular hardware incompatibility w/VLB and the Acer Magic S23A sound card. No issue with PCI card in this respect. The issue is duplicable on both of my M919 v3.4 boards.

Can I confirm that if you use 128 MB on your m919 w/1024K that you no longer witness slow downs? And did you also noticed that if you use exactly 64 MB, that you see a slow down in Quake?