will this work on an amd atx motherboard in a full-tower case?

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Yes, but with some important asterisks. Let me break it down: ✅ What works - *PCIe slot:* PCIe 3.0 x8 card. Physically fits in any x8 or x16 slot — every AMD ATX board (X570, B550, X670, B650, TRX40, WRX80, etc.) has slots that work. - *Power:* ~25W, all drawn from the slot. No external PCIe power needed. - *Case:* Full-tower has plenty of room. The card is full-height, half-length (FHHL) — fits anywhere. - *Cables:* Uses standard Mini-SAS HD (SFF-8643) — connect to backplane or breakout cables to your drives. Standard stuff. ⚠️ The "FIO" trap *FIO = Factory Integrated Option.* This card was designed to be factory-installed in HP ProLiant servers (DL380 Gen9, DL360 Gen9, etc.). Two real issues: *1. The mounting bracket is wrong.* FIO cards come with HP's proprietary server bracket that *does not fit a standard ATX case slot.* Customer will need to either: - Source a standard P840 PCIe bracket (HP sells them, ~$10-15 on eBay, search "P840 standard bracket") - Swap the bracket from a non-FIO P840 if they have one - Some people zip-tie / improvise — works but ugly and not secure *2. Some HP cards POST-hang in non-HP boards.* The P840 is generally one of the friendlier ones — most users report it works on AMD/Intel consumer boards. But you should expect: - Long boot delay on first POST while card initializes - May need to disable "Fast Boot" in UEFI - Some BIOSes flag it as "Option ROM" and need legacy boot or CSM enabled to fully initialize - Won't work as a boot drive controller on every consumer board (data drives are fine) ⚠️ The cache battery situation P840 has 4GB Flash-Backed Write Cache (FBWC) which requires a *capacitor pack + cable* to enable write caching safely. If the listing doesn't include the cap pack: - Card still works, but write cache stays disabled (slower) - Cap packs are $15-30 separately - Ask seller before buying if not specified My recommendation for the customer This card works fine on AMD ATX as a *storage/RAID controller* in a homelab/server build, *if* they: 1. Get a standard PCIe bracket 2. Are okay with HP's drivers (Windows Server-style, some quirks on consumer Win10/11) 3. Have or can buy the FBWC capacitor pack 4. Aren't trying to boot Windows from it (use a separate NVMe for OS) On Tue, May 5, 2026 at 6:38 PM Newegg Customer < C731c3cd22fe741ccbd4982997c94df2a@marketplace.newegg.com> wrote: > ----- From: To: ----- > > > ## Source: Product Detail Page Q&A ## > ## Your reply will be reviewed. Once approved, it will appear on the > product detail page. ## > ## Please provide a clear and complete answer to help customers understand > the product clearly and boost sales. ## > > Question: > will this work on an amd atx motherboard in a full-tower case?

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