I do not believe so .

Best bet is probably recapping (or having someone do it) an otherwise decent vintage power supply .

It would be nice if somebody put together an adapter that you could plug between an ATX power supply and motherboard, that adapter would then feed the motherboard 5v derived from a 12v rail using a DC to DC converter .

I read the Radeon 9500 128mb only draws 12 watts with a max of about 30 watt and uses 3.3v. Depending on your board that is supplied directly from the 3.3v PSU or thru a VRM off the 5v or 12v lines. If you disconnect one of the HD's that will free up a little of both 5v and 12v and could point to whether it is the 5v or the 3.3v line that is insufficient.

3.3v is taken from un-rectified 5V winding on the PSU via another inductor sized correctly to produce 3.3V. So you will have problems still.

Needs fatter QUALITY 5V PSU.

Cheers,

In Romania I found these and so far I bought like.... 6 or 7 of them (30 amps on the 5V rail, up to 180W, extremely quiet,Thunderbird 1.4 GHz works flawlessly together with a GeForce 3 Ti 200).
But not sure if you can find them in any other countries.

I seem to remember someone saying that the motherboards that have the 4pin P4 plug are not entirely safe from this issue either and you still need a powerful 5V line. Has anybody ever looked into that?

OP, are you running the original Thoroughbred 2800+ or a Barton model? Phil's Computer Lab tested a couple of PSUs and Duron/Athlon processors some years back and found that even a lowly Corsair VS450 can handle Durons all the way up to ~57W TDP, although I'm not sure if those numbers can be trusted (not to mention TDP is weird).

Barton 2800. I may just buy a Radeon 9600 Pro it doesn't need external power and is faster. Plus my 9500 won't unlock without artifacts anyway

Barton 2800+ is typically 68 to 70w.

Needs very strong 5V current. High quality PSU is a must. Seasonic 750W will do this.

Cheers, Jason

pentiumspeed wrote on 2020-04-25, 21:44:

Barton 2800+ is typically 68 to 70w.

Needs very strong 5V current. High quality PSU is a must. Seasonic 750W will do this.

Cheers, Jason

Yes I know the $200 psu's can handle the 5v load I'm trying to avoid that price. I'm going to start shopping around I guess for a 2003-2004 seasonic, antec, or similar in quality.

Yes good thinking. Later after this I noticed same thing. Older ones but good quality do come up if looking for it.

Cheers,

candle_86 wrote on 2020-04-25, 23:43:

pentiumspeed wrote on 2020-04-25, 21:44:

Barton 2800+ is typically 68 to 70w.

Needs very strong 5V current. High quality PSU is a must. Seasonic 750W will do this.

Cheers, Jason

Yes I know the $200 psu's can handle the 5v load I'm trying to avoid that price. I'm going to start shopping around I guess for a 2003-2004 seasonic, antec, or similar in quality.

Actually most of the new Seasonics are limited to 100 watts max combined on the +3.3 and 5v. What you want is an older Antec TruePower, like the Truepower 480. They can be found for about $30 on Ebay. I have two and they do work very well for the older ATX that needs a lot of +3.3 and +5v like Athlon, Slot 1 and P4 boards. They can truly deliver 280w from the combined 3.3+5v with a max of 460w including the 12v. There are some others from the 2000-2004 era that also have very high combined 3.3+5v if you look around.
I included the Antec PDF plus some of Seasonics for comparison

I still have my Vantec Stealth from back when, only does 47A on 5V 🙁

on any new power supplies ~25A is pretty much the best you can get.
3.3V+5V being combined was the norm during socket A days already iirc.

imi wrote on 2020-04-26, 01:01:

I still have my Vantec Stealth from back when, only does 47A on 5V 🙁

on any new power supplies ~25A is pretty much the best you can get.
3.3V+5V being combines was the norm during socket A days already iirc.

Wow ! I remember that name, yes they had good PSU's. There is a couple of the old 420w on ebay right now for $40-60 with shipping. There also is a Antec True 550w for about $35. Of course they all might need new caps or maybe not.

I checked ebay and see used Antec with 30A and other with 40A on 5V but price is high. Is there other quality alternatives other than Antec? Seasonic is thin on this.

Cheers,

Skimping on power supplies is like skimping on car tyres. Yes you can, but it's almost never a good idea.

pentiumspeed wrote on 2020-04-26, 02:22:

I checked ebay and see used Antec with 30A and other with 40A on 5V but price is high. Is there other quality alternatives other than Antec? Seasonic is thin on this.

Cheers,

Back in the day most Antec were actually built by Seasonic under contract and there were few (if any) retail Seasonic because they primarily sold to OEM's.
I do not think $40 for a good old PSU is high. What is high is the prices they charge now considering it is mostly made in China where the parts add up to about $10-20 but name brands want $100-$200 for that assembled.... yeah right

CAD is about 50 to 80 plus shipping north of 30 to 50. And that's truepower 550W with 40A. I'll just wait and get one.

Would like to know about other brands that seasonic made for others as well with fat 5V current?

Remember, exchange rate is lopsided.

Cheers,

pentiumspeed wrote on 2020-04-26, 03:19:

CAD is about 50 to 80 plus shipping north of 30 to 50. And that's truepower 550W with 40A. I'll just wait and get one. […]
Show full quote

CAD is about 50 to 80 plus shipping north of 30 to 50. And that's truepower 550W with 40A. I'll just wait and get one.

Would like to know about other brands that seasonic made for others as well with fat 5V current?

Remember, exchange rate is lopsided.

Cheers,

Ahh ok. wish you would add the CA to your profile. Not sure why some refuse to acknowledge the country they live in but that is ok. Well ok guess if you from Somalia you would not want others to know ;p

Here are my thoughts:

1. The requested ratings for power supplies were so high back then because 95% of power supplies being sold were absolute trash. If you read some of the Johnny Guru and Hardocp power supply reviews back then, you would have seen some that they actually bothered to review that wouldn't even meet 50% of the rated output before they fried or caught on fire or blew up. And those generally weren't even the cheap crap that was the norm back then.

2. I have KT7A setup with a Barton Mobile 2800+ that has a newer Seasonic power supply in it. Definitely not one of the higher 5v and 3.3v rail power supplies. It overclocks fine to about 2.3Ghz. I was thinking that the motherboard was the limiting factor but now I am not 100% sure as I forgot about the power output ratings of the power supplies back then.

3. Because of this being brought up, I ended up buying a couple PSUs off of eBay just now. a NIB Antec TruePower 550w (first version) and a used ToPower 650w. Both were not expensive and I did a lot of research on brands from back then.

4. Here are some brands to look for in no particular order:
1. Antec
2. ToPower / ePower
3. Zalman
4. Enermax
5. Seasonic
6. Zippy
7. Super Flower
8. Silverstone
9. RaidMax

Here are some new (open box) Zalman 400w PSUs for $29.95 shipped in the USA that meet the criteria you are looking for:
https://www.ebay.com/itm/ZALMAN-ZM400B-APS-40 … ly/264662939178 (this is the newer model)
https://www.ebay.com/itm/ZALMAN-ZM400A-APF-40 … ly/142787727379
https://www.ebay.com/itm/ZALMAN-ZM400A-APF-40 … ly/264634617097

used ePower 650w for about $45 shipped:
https://www.ebay.com/itm/ePower-silent-engine … 50/233443925702

used Antec TruePower 550w for $33 shipped:
https://www.ebay.com/itm/Antec-TruePower-550- … ly/173831986643

There are some new power supplies with decent 5v and 3.3v rails for pretty cheap.. as in $24.95 shipped, but I am not convinced that they aren't crap so I am not going to even bother linking.. just search for 650w power supply and search by price lowest to highest.