Optimal Shop
20+4 Pin LCD Computer Power Supply Tester for SATA IDE HDD ATX ITX BYI Connectors-Black
Bottom line: The Optimal Shop 20+4 Pin LCD Computer Power Supply Tester ($15.99 on Amazon as of 2026-10-06): Tests 8 connector types: 20/24-pin ATX, HDD, 4-pin floppy, PCI-e 6/4/8-pin, SATA; main trade-off: LCD only powers up from the 20-pin/24-pin connector, not from SATA or PCI-e alone.
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*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
Pros & Cons
Pros
- ✓ Tests 8 connector types: 20/24-pin ATX, HDD, 4-pin floppy, PCI-e 6/4/8-pin, SATA
- ✓ 1.8-inch LCD reads out rail voltages directly, no multimeter probing
- ✓ Buzzer alarm fires when the Power Good signal fails
- ✓ Shows +12V, +3.3V and +5V on the left indicators during HDD/SATA/PCI-e tests
- ✓ Aluminum alloy shell is light, conducts heat, and resists corrosion
Cons
- ✗ LCD only powers up from the 20-pin/24-pin connector, not from SATA or PCI-e alone
- ✗ Requires the 4-pin P4 lead as well, or it alarms and displays LL
- ✗ Screen scratches easily, so the factory protective film is worth leaving on
- ✗ Reports voltages, not load behavior, so a PSU can pass here and still sag under gaming load
Manufacturer description
The Optimal Shop 20+4 pin LCD power supply tester gives you a fast way to answer the question every dead build raises: is the PSU actually the problem? Plug the 20-pin or 24-pin ATX connector plus the P4/P6/P8 lead into the tester, flip the power on, and the 1.8-inch LCD reports the rail voltages directly instead of leaving you to probe with a multimeter. It covers eight connector types in one unit: 20-pin and 24-pin ATX, HDD, 4-pin floppy, PCI-e 6-pin, 4-pin, 8-pin, and SATA. When you test a drive or PCI-e lead, the left-side indicators read out the +12V, +3.3V, and +5V outputs. A buzzer…
SpecPicks Verdict
SpecPicks scored Optimal Shop 20+4 Pin LCD Computer Power Supply Tester using a rating × review-volume × price-fit model applied to published specs and reviews across the power supplies category. Optimal Shop's power supplies lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for power supplies of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Frequently Asked Questions
Which power supply connectors does this tester support?
Eight types: 20-pin and 24-pin ATX, HDD, 4-pin floppy, PCI-e 6-pin, 4-pin, 8-pin, and SATA.
Why does the tester show LL and beep when I plug in the 24-pin?
The 4-pin P4 lead is not connected. Insert the 4-pin connector into the 4P position on the tester and the reading will come up.
Does the LCD work if I only connect a SATA or PCI-e cable?
No. The 1.8-inch LCD is powered by the 20-pin/24-pin connector. With HDD, floppy, PCI-e or SATA leads, the left-side indicators show +12V, +3.3V and +5V instead.
How do I know if the power supply passed the test?
After you power on you hear two tones, and if none of the voltage groups flash, the input is normal. If a rail is missing or out of range, the buzzer alarms.
Is there a scratch on the screen out of the box?
That is the protective film the manufacturer applies because the screen scratches easily. You can peel it off if you prefer, but leaving it on protects the display.
Key Features
- 8-in-1 ATX power supply tester: Support testing 20-pin IDE/24-pin IDE/HDD/floppy disk 4-pin/PCI-e 6-pin/4-pin/8-pin/SATA connector.
- Aluminum alloy shell: light and easy to carry, high strength, good thermal conductivity and corrosion resistance.
- 1.8" LCD screen: The output voltage is displayed on the 1.8" LCD screen, which is easy to read (1.8" LCD screen is powered by the 20-pin/24-pin connector). Note: Is there a scratch on the product screen? Because the screen is easy to scratch, we put a protective film on it, if you think it is not beautiful, you can tear it off by yourself.
- Buzzer alarm: When your power supply PG number fails, the power tester will emit a buzzer alarm, which is easy to know.
- When testing with HDD/floppy disk 4-pin/PCI-e 6-pin/4-pin/8-pin/SATA connector, the indicator on the left shows the output voltage (+12V + 3.3V + 5V).
Full Specifications
| Brand | Optimal Shop |
|---|---|
| Color | Black |
| Model | Optimal Shop |
| Part Number | Optimal Shop |
| Buzzer alarm | When your power supply PG number fails, the power tester will emit a buzzer alarm, which is easy to know. |
| Item Dimensions | 8.3 x 3.7 x 0.8 inches |
| Compatible Devices | Personal Computer |
| Aluminum alloy shell | light and easy to carry, high strength, good thermal conductivity and corrosion resistance. |
| Item dimensions L x W x H | 8.3 x 3.7 x 0.8 inches |
| 8-in-1 ATX power supply tester | Support testing 20-pin IDE/24-pin IDE/HDD/floppy disk 4-pin/PCI-e 6-pin/4-pin/8-pin/SATA connector. |
Ready to buy?
20+4 Pin LCD Computer Power Supply Tester for SATA IDE HDD ATX ITX BYI Connectors-Black is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.
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