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Power Supply Replacement for Old Gaming PC - Althon Thunderbird

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First post, by aieros

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Hello,
I assembled an computer yesterday from old/new parts.
Currently, the computer has the following components:

CPU : AMD Athlon 1.2Ghz (OC to 1.4Ghz) Thunderbird Socket 462/A
Cooler: ZALMAN CNPS7000B-Cu (NOS)
Motherboard: EPOX EP-8KHA+ (Fully Recapped with Nichicon Capacitors)
Sound Card: Creative Labs Live! 5.1 (SB0100)
Video Card: 3Dfx Voodoo 5 5500 AGP
Drives: IDE-to-SATA Adapter/120GB SSD (Patriot Burst)
Power Supply: Corsair HX1000W (Dual Rail 3.3v[30A]/5V[30A])
Case: Antec VSK4000E
Fans: 2x Noctua Redux 120MM 3 Pin

My question is, what kind of power supply would I need to replace the one above?
This power supply is from 2008, so I feel that it's a ticking time bomb. Voltages seem stable, etc.
However, because of it's advanced age, I don't particularly trust it. From what I've read, I'd need a replacement that has 20/24A+ on the 5V/3.3V rails?
The most I could find is a eVGA Power Supply (700W) that gives 24A on the 5V and 20A on 3.3V. (80+Bronze)
(Most the modern high end power supplies I could find, usually only have 20A for both 3.3V/5V)

Please let me know if this would be sufficient, or if there's something better?

Thank You!

WinXP: Intel Core2 Extreme QX6700,4GB DDR2,Intel D975XBX2KR,GTX590,Ageia PhysX,X-Fi
WinXP: AMD Athlon 64 FX62,4GB DDR2, Biostar GF7050-M2,GTX670,X-Fi Titanium
Win98: AMD Althon 1.4Ghz, 512MB PC133,Epox 8KHA, 3Dfx Voodoo 5 5500 AGP, SB Live! Gold

Reply 1 of 4, by brian105

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The PSU still works so I wouldn't replace it. 2008 is long after the capacitor plague and it's also a good quality unit.

Presario 5284: K6-2+ 550 ACZ @ 600 2v, 256MB PC133, GeForce4 MX 440SE 64MB, MVP3, Maxtor SATA/150 PCI card, 16GB Sandisk U100 SATA SSD
2007 Desktop: Athlon 64 X2 6000+, Asus M2v-MX SE, Foxconn 7950GT 512mb, 4GB DDR2 800, Audigy 2 ZS, WinME/XP

Reply 2 of 4, by red-ray

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I like to use PSUs that tell me how many amps get used, looking at the SIV save files my system with a Thunderbird @ 1100 MHz it maxes out at < 14 amps.

It's just had a PSU change as the PSU from 2009 died.

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Last edited by red-ray on 2026-02-14, 11:44. Edited 2 times in total.

Reply 4 of 4, by Fish3r

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There's a couple of seasonic units I know of

- SSP-650 RS: industrial model that can still be purchased new and has a 35A 5V limit, however it's extremely loud out of the box and you'll want to replace the fan. I run a dual P3 1GHz system on this and it works great.

- FOCUS GX: some of these have a 25A 5V limit, which will probably work fine

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