Dell OptiPlex GX520, GX620, 745 & 755 Spare Parts Cross-Reference Guide
The Dell OptiPlex GX520, GX620, 745 and 755 were among the most widely used business desktops of their time, and many still run tills, machine controllers and older software that cannot easily be moved. Dell no longer supplies parts for them, and the right spare is hard to identify because each model came in four case sizes that use different boards, heatsinks and cables.
This page cross-references the spares we hold for these models as physical stock at our warehouse in Pentre, South Wales. It also covers the closely related OptiPlex 320, 330, 360 and 740. Use Ctrl+F to search for the number printed on your part.
How to find your Dell part number
- Dell part number: Dell parts carry a five-character code such as KW628, usually on a white barcode label after the letters DP/N.
- Leading zero: the label normally shows the code with a zero in front, such as 0KW628. Search this page without the zero.
- Check the case size: these models came as a mini tower (MT), desktop (DT), small form factor (SFF) and ultra small form factor (USFF). Most parts fit only one case size, so check the Fits column.
For other models, see the OptiPlex GX150 to GX280 guide and the OptiPlex 760, 780, 960 and 980 guide. For more help, see our guide to finding part numbers on Dell, HP, Lenovo and Fujitsu parts.
System boards
Heatsinks & heatsink brackets
| Dell part number | Fits | Description | |
|---|
| N9170 | GX520, GX620 desktop | Heatsink | View part |
| D7931 | GX520, GX620, 745, 755, 210L, 320 desktop | Heatsink with shroud | View part |
| CC079 / D9416 | GX520, GX620 SFF | Heatsink with bracket | View part |
| Y1851 | GX520, GX620, 745 USFF | Heatsink | View part |
| MR313 | 740 desktop | Heatsink | View part |
| HR004 | 740, 745, 755, 760 tower | Heatsink | View part |
| JP911 | 745, 755 SFF | Heatsink, copper base | View part |
| UP048 | 745, 755 SFF | Heatsink | View part |
| H895D / H896D | 745, 755, 760 SFF | Heatsink with bracket | View part |
| RW134 | 755 desktop | Heatsink with bracket | View part |
| JY385 / HR544 | 360, 380, 760 desktop | Heatsink with clip | View part |
| X5653 | GX520, GX620, 320 desktop | Heatsink support bracket | View part |
| G8855 | GX520, GX620, 755 SFF | Heatsink support bracket | View part |
| H1663 | GX520, GX620 USFF | Heatsink support bracket | View part |
| R6761 | GX520, GX620, 210L, 755, 780 | Heatsink support bracket | View part |
| U2336 / U2313 | GX520, GX620 USFF | Air flow baffle and heatsink cover | View part |
| XU443 | 745 desktop | Heatsink retention bracket | View part |
| RP913 | 745, 755 tower | Heatsink support bracket | View part |
| JN738 | 330 tower | Heatsink support bracket | View part |
Fans
| Dell part number | Fits | Description | |
|---|
| U8679 | GX520, GX620 USFF | Case fan (San Ace 9G0612P1M041) | View part |
| U1295 | GX520, GX620 USFF | Case fan (Sunon PMD1206PMB3-A) | View part |
| HU540 | 745, 755 SFF | Case fan (Sunon PMD1208PMB1-A) | View part |
| HU540 | 745, 755, 760 | Case fan (Forcecon DF803812MDOT) | View part |
| HU540 | 745, 755, 760 | Case fan (San Ace 80 9G0812P1F081) | View part |
| NY290 / NJ793 / TJ160 / TJ180 | 740, 745, 755, 760 SFF | Hard drive fan | View part |
| M556N / G944P | 755, 760 | Fan (Forcecon DFS803812MDOT) | View part |
| RR527 | 755, 780 tower | Fan (Foxconn PV123812DSPF) | View part |
Power button boards, front panels & cards
| Dell part number | Fits | Description | |
|---|
| MJ047 | GX520, GX620 tower | Power button switch board with USB | View part |
| UJ268 / WJ855 | 320 desktop | Front I/O power button switch board | View part |
| GX402 | 740 desktop | Front audio and USB board | View part |
| UF888 | 745 | Power button switch board with USB | View part |
| HJ318 | 745 desktop | Power button switch board with USB | View part |
| CG250 / TJ853 | 745 tower | Power button switch board with USB | View part |
| XW055 | 745, 755, 760 | Power button switch board with USB | View part |
| RY698 | 755, 760 desktop | Power button switch board with USB | View part |
| TP004 | 755, 760, 780, 360 | Front I/O power button switch board | View part |
| FH868 | GX620, GX520, GX280 | Low-profile PCIe DVI add-on card | View part |
Drive caddies, blanks & covers
| Dell part number | Fits | Description | |
|---|
| U6436 | GX520, GX620, 745 tower | Hard drive caddy | View part |
| NH645 | 740, 745, 755, 760 SFF | Hard drive caddy | View part |
| PG027 / UU520 | 745, 755 USFF | Hard drive caddy | View part |
| M6774 | GX520, GX620 | Floppy drive bay blank | View part |
| K9033 | GX520, GX620 SFF | 3.5-inch drive cover | View part |
| J9357 | GX520, GX620 SFF | PCI bracket holder cover | View part |
| Y2283 / H3592 | GX520, GX620, 745, 755 USFF | CD drive bay blank | View part |
| XJ412 | 740, 745, 755 SFF | Floppy drive cover | View part |
| HJ478 / MJ058 | 745, 755 | Floppy drive bay blank | View part |
| MJ126 | 745, 755 | 5.25-inch optical drive bay blank | View part |
| NJ779 | 320, 745, 755, 760 | Floppy drive cover bezel blank | View part |
Cables: GX520 & GX620
| Dell part number | Fits | Description | |
|---|
| C6012 | GX520, GX620, 210L desktop | Optical drive cable | View part |
| WC679 | GX520, GX620, 210L desktop | Front panel cable | View part |
| — | GX520, GX620 desktop | Internal case speaker | View part |
| Y5391 | GX520, GX620, 320, 210L tower | Optical drive IDE cable | View part |
| Y5393 | GX520, GX620 tower | Front panel USB cable | View part |
| M8865 | GX520, GX620, 210L tower | SATA drive cable, 55cm | View part |
| N8370 | GX520, GX620 SFF | Front panel cable | View part |
| M8098 | GX520, GX620 SFF | Hard drive SATA cable | View part |
| MK275 | GX620, 320 | Front panel cable | View part |
| — | GX620 USFF | Chassis intrusion button cable | View part |
| P9847 | GX520, GX620, 745, 755 SFF | Front panel cable | View part |
| U5959 | GX520, GX620, 745, 755 desktop | SATA drive cable | View part |
| W5775 | GX520, GX620, 745, 755 | Floppy drive cable, 43cm | View part |
| D9901 | GX520, GX620, 745, 755, 760 desktop | Case speaker, 5-pin 4-wire | View part |
| D9899 | GX520, GX620, 745, 755, 760 SFF | Internal case speaker | View part |
| H9738 / D6805 | SX280, GX520, GX620, 745, 755 USFF | SATA cable, 13cm | View part |
| U2837 | SX280, GX520, GX620, 745, 755 USFF | Hard drive SATA power cable | View part |
Cables: 745 & 755
| Dell part number | Fits | Description | |
|---|
| MK082 | 740, 745 desktop | Front USB panel cable | View part |
| MK154 | 740, 745 SFF | Front USB panel cable | View part |
| RH537 | 745 tower | Front USB panel cable | View part |
| FC541 | 745, 755 | Optical drive SATA cable, orange | View part |
| HH942 | 745, 755 SFF | Optical drive SATA cable, orange | View part |
| MK524 | 745, 755 SFF | Hard drive SATA cable, 25cm | View part |
| UC635 | 745, 755 SFF and desktop | Chassis intrusion cable | View part |
| UM941 | 745, 755, 760 SFF | Front USB panel cable | View part |
| FT231 / NJ889 | 745, 755, 760 SFF | Thermal sensor cable, 2-pin, 21cm | View part |
| UX136 | 745, 755, 760 USFF | Hard drive SATA power cable | View part |
| F787C | 755, 760, 780 desktop | Optical drive SATA cable | View part |
| MD713 | 755, 760, 980 SFF | Optical drive SATA cable | View part |
| XT029 | 755, 780 | Front I/O panel cable | View part |
| WR796 | 330, 380, 755, 760 desktop | Front USB panel cable | View part |
Drives & CMOS batteries
| Dell part number | Fits | Description | |
|---|
| DU066 | 745 SFF | CD-RW / DVD-ROM drive (CRX880A) | View part |
| WG939 / FD167 | 745 SFF | CD-RW / DVD-ROM drive (GCC-4244N) | View part |
| GJ309 | 745, 755 SFF | Floppy drive (MPF820) | View part |
| — | 210, 280, 320, 330, 360 | New CMOS battery | View part |
| — | 740, 745, 755, 760 | New CMOS battery | View part |
| — | 740, 745, 755, 760, 780, 790 | New CMOS battery | View part |
This list is checked against our live stock. Parts that sell out are removed and new stock is added automatically.
Can’t see your part?
We hold more OptiPlex stock than is listed online, including uncatalogued donor machines. Send us the Dell part number, the model and the case size through our engineering enquiry form or email info@sierra-indigo.com and we’ll check the shelves. Orders placed before 14:00 on weekdays are dispatched the same day. You can also browse all our Dell spares.
Clearing out old OptiPlex desktops? We collect and recycle redundant computers through our computer recycling service, with certified data sanitisation.
