Siglent SPD3303X-E
#3 in Multi-outputFull review
A quiet triple-output linear supply for electronics labs that power analog and logic rails at once.
Amazon $459$459
The Siglent SPD3303X-E is the better bench power supply overall, rated 3.6 to 3.5. The Siglent SPD3303X-E leads on value. The GW Instek GPP-4323 wins on resolution and protection & features. The Siglent SPD3303X-E costs $438.86 less ($459 vs $897.86).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
GW Instek GPP-4323
#4 in Multi-outputFull review
A four-channel programmable supply for labs that need many precise rails and automated tests in one unit.
Amazon $897.86$897.86
Which should you buy?
- Choose the Siglent SPD3303X-E for value ($2.09 per watt ($459, 220 W rated) vs $4.24 per watt ($897.86, 212 W from the channel ratings)).
- Choose the GW Instek GPP-4323 for resolution (1 mV / 0.1 mA setting resolution vs 10 mV / 10 mA setting resolution) and protection & features (over-voltage protection, over-current protection, stored setups vs stored setups).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every multi-output bench power supply; a clear win is highlighted. How we rank explains each one.
| Factor weight | Siglent SPD3303X-E | GW Instek GPP-4323 |
|---|---|---|
| Overall rating | 3.6/5 | 3.5/5 |
| Value 25% | 25 $2.09 per watt ($459, 220 W rated) | 5 $4.24 per watt ($897.86, 212 W from the channel ratings) |
| Output quality 20% | 96 0.3 mVrms ripple and noise | 96 0.3 mVrms ripple and noise |
| Resolution 15% | 25 10 mV / 10 mA setting resolution | 100 1 mV / 0.1 mA setting resolution |
| PC control 15% | 100 USB, LAN with SCPI | 100 USB, RS232, LAN with SCPI |
| Protection & features 10% | 20 stored setups | 80 over-voltage protection, over-current protection, stored setups |
| Warranty 15% | 100 3-year warranty | 0 warranty not published, scored as none |
Specifications
| Siglent SPD3303X-E | GW Instek GPP-4323 | |
|---|---|---|
| Output | ||
| Type | Power supply | Power supply |
| Regulation | Linear | - |
| Channels | 3 | 4 |
| Channel ratings | 32 V/3.2 A, 32 V/3.2 A, 2.5/3.3/5 V/3.2 A | 32 V/3 A, 32 V/3 A, 5 V/1 A, 15 V/1 A |
| Max voltage | 32 V | 32 V |
| Max current | 3.2 A | 3 A |
| Rated power | 220 W | 212 W (channels added) |
| Ripple and noise | 0.3 mVrms | 0.3 mVrms |
| Precision | ||
| Setting resolution | 10 mV / 10 mA | 1 mV / 0.1 mA |
| Readback resolution | 10 mV / 10 mA | 0.1 mV / 0.1 mA |
| Control | ||
| PC interfaces | USB, LAN | USB, RS232, LAN |
| SCPI | Yes | Yes |
| Stored setups | 5 | 10 |
| Over-voltage protection | - | Yes |
| Over-current protection | - | Yes |
| Build | ||
| Weight | 17.6 lb | 16.5 lb |
| Warranty | 3 years | - |