# Power Supply HP 500W Platinum 865403-B21-RFB ATX 12V

**URL:** https://aio.lv/en/product--hp-865403-b21-rfb--11591144
**Data updated:** 2026-01-12 19:35 (EET)
**Category:** Computer Component Accessories
**Manufacturer:** HP
**Manufacturer code:** 865403-B21-RFB
**EAN:** 5715328133105
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 32.49 €
**Prices and availability valid until:** 2026-07-22 23:59
**Price without VAT (21%):** 26.85 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--hp-865403-b21-rfb--11591144

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 09.07.2026 | free |
| Pickup points | 14.07.2026 | 1.89 EUR |
| Courier delivery to door | 14.07.2026 | 4.99 EUR |

## Summary description

HP 500W Platinum power supply, model 865403-B21-RFB, is an ATX 12V internal unit delivering up to 500 watts with Platinum efficiency rating. Designed for HP systems requiring a high-efficiency PSU, it provides stable 12V rails and reliable power for servers or workstations. Suitable for replacements or upgrades where manufacturer compatibility and energy efficiency matter.

## Long description

HP 500W Platinum 865403-B21-RFB ATX 12V is an internal power supply unit that delivers up to 500 watts of continuous power with a Platinum efficiency rating. Manufactured for HP systems, this PSU provides stable 12V rails and is intended for installations in compatible desktops, workstations or rack servers that require an ATX 12V form factor and high energy efficiency. The model 865403-B21-RFB is identified by HP part numbering and EAN 5715328133105.
Advantages
This HP 500W Platinum power supply combines high efficiency and predictable voltage regulation on the 12V rail, which reduces heat and lowers overall system power consumption. The Platinum efficiency rating ensures better energy use compared with lower-rated units, helping to comply with power and thermal budgets in professional environments. Built to HP compatibility specifications, the unit is suitable for direct replacement of matching systems, reducing integration effort and configuration changes.
Suitable for
 Replacement of original HP internal PSUs requiring model 865403-B21-RFB or matching specifications
 Upgrading workstations or small rack servers to a higher-efficiency power supply
 Systems that need stable 12V rail supply for processors, storage and expansion cards
 Environments where energy efficiency and reduced heat output are required
Key specifications
 Brand: HP
 Model / MPN: 865403-B21-RFB
 EAN: 5715328133105
 Form factor: ATX 12V internal PSU
 Maximum output power: 500 W
 Efficiency rating: Platinum
How to use
Install the HP 500W Platinum 865403-B21-RFB into a compatible HP chassis following the manufacturer's service manual and standard ESD precautions. Ensure the system is powered off and unplugged before removal of the existing PSU. Secure the unit in the PSU bay, connect the required 12V and auxiliary connectors to the motherboard and peripherals, verify connector seating, and power on the system to confirm stable operation. Monitor system voltages briefly after first startup to confirm correct installation.
Usage recommendations
Use this unit as a direct replacement in systems listed by HP as compatible with part number 865403-B21-RFB. Maintain proper airflow in the chassis and keep vents clear to preserve efficiency and thermal performance. For critical systems, verify firmware and BIOS compatibility and test under expected load conditions before returning the system to production.

## FAQ

### How much does the Power Supply HP 500W Platinum 865403-B21-RFB cost, and is it available for purchase?

The price is 32.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 5 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 09.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All HP products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized HP service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty