Replacement for 645-ULTRA-C: Drop-In Alternatives We Stock
Looking for a replacement for the 645-ULTRA-C (645 ULTRA-C - MSI 645 Ultra-C Desktop Board SiS 645 Socket 478 400MHz FSB 3GB DDR SDRAM DDR333/PC2700, DDR266/PC2100, DDR200/PC1600 ATX)? Pro Disk Network ships drop-in replacements and equivalent modern parts from US inventory. Every alternate below is in-stock today with same-day shipping for orders placed before 2pm ET. If your unit is still under warranty, contact our engineering team — we offer cross-shipping for B2B customers on Net 30 terms.
About the 645-ULTRA-C
| SKU | 645-ULTRA-C |
|---|---|
| Product | 645 ULTRA-C - MSI 645 Ultra-C Desktop Board SiS 645 Socket 478 400MHz FSB 3GB DDR SDRAM DDR333/PC2700, DDR266/PC2100, DDR200/PC1600 ATX |
| Stock status | In Stock |
| Detail page | View 645-ULTRA-C › |
Drop-in replacements for 645-ULTRA-C
Each part below is currently in our US warehouse, ships same-day for orders before 2pm ET, and includes our 90-day warranty. SKUs link to the full product page with photos, datasheets and B2B quote form.
P4S8X-MX - ASUS SiS 661GX/SiS 964 Chipset Pentium 4/ Celeron Processors Support Socket LGA478 micro-ATX Motherboard
SKU: P4S8X-MX
Price: $326.00
5187-0317 - HP System Board (Motherboard) Socket 478 for Pavilion 7xx Series SIS Desktop
SKU: 5187-0317
Price: $205.26
K8S-MX - ASUS Asus K8S-MX Desktop Motherboard SiS Chipset Socket PGA-754 1 x Processor Support 2 GB Floppy Controller Serial ATA/150 Ultra ATA
SKU: K8S-MX
Price: $282.20
D201GLY2 - Intel SIS SIS662 Micro ATX ESSENTIAL Series Desktop Motherboard
SKU: D201GLY2
Price: $235.79
P4S800-MX - ASUS Socket 478 P4/Celeron Motherboard max 3.06GHz+ SIS 661FX/963L
SKU: P4S800-MX
Price: $239.47
745884-001 - HP AMD A76M System Board (Motherboard) for ProBook 645 Gen1
SKU: 745884-001
Price: $235.79
9BE011-645 - Seagate DB35 Series 80GB 7200RPM IDE Ultra ATA/100 (ATA-6) 2MB Cache (CE) 3.5-inch Hard Drive
SKU: 9BE011-645
Price: $166.29
9BE012-645 - Seagate DB35 Series 160GB 7200RPM IDE Ultra ATA/100 (ATA-6) 2MB Cache (CE) 3.5-inch Hard Drive
SKU: 9BE012-645
Price: $192.08
How we pick replacements
Every recommendation above was selected using these criteria:
- Drop-in compatibility — same form factor (2.5"/3.5", PCIe slot, SFP port, etc.), so it fits the original chassis without modification
- Equivalent or better performance — matched on RPM/IOPS/speed/throughput, never downgraded
- Same-brand-preferred — we list the OEM-equivalent first when available, then trusted aftermarket
- Warranty coverage — 90-day Pro Disk warranty on every part, with 1-year option for B2B
- In stock today — never recommend a part that is on backorder
Need help confirming compatibility?
Our engineers validate every replacement against your specific server, switch, or chassis model before shipment. Email sales@prodisknetwork.com with your platform model (e.g., Dell PowerEdge R740, HP DL380 Gen10, Cisco Catalyst 9300) and we will confirm the exact part number that drops into your hardware.