I have the following old computer:--------[ Summary ]----------------------------------------------------------------------------------------------------- Computer: Operating System Microsoft Windows XP Home Edition OS Service Pack Service Pack 3 Motherboard: CPU Type Unknown, 2600 MHz (13 x 200) Motherboard Name Unknown Motherboard Chipset Unknown System Memory 2048 MB BIOS Type Award (06/08/05) Communication Port Communications Port (COM1) Communication Port ECP Printer Port (LPT1) Display: Video Adapter NVIDIA GeForce 8800 GTS (640 MB) Monitor HYUNDAI ImageQuest L90D+ Digital [NoDB] (151711984) Multimedia: Audio Adapter NVIDIA® nForce Audio Codec Interface [NoDB]--------[ DMI ]--------------------------------------------------------------------------------------------------------- [ BIOS ] BIOS Properties: Vendor Phoenix Technologies, LTD Version ASUS A8N-E ACPI BIOS Revision 1005 Release Date 06/08/2005 Size 512 KB Boot Devices Floppy Disk, Hard Disk, CD-ROM, ATAPI ZIP, LS-120 Capabilities Flash BIOS, Shadow BIOS, Selectable Boot, EDD, BBS Supported Standards DMI, APM, ACPI, PnP Expansion Capabilities PCI, USB [ Motherboard ] Motherboard Properties: Manufacturer ASUSTeK Computer INC. Product A8N-E Version 2.XX Serial Number 123456789000 [ Memory Controller ] Memory Controller Properties: Error Detection Method 64-bit ECC Error Correction None Supported Memory Interleave 1-Way Current Memory Interleave 1-Way Supported Memory Speeds 70ns, 60ns, 50ns Supported Memory Types SPM, SDRAM Supported Memory Voltages 2.9V Maximum Memory Module Size 1024 MB Memory Slots 4 [ Processors / AMD Athlon 64 FX-55 Processor ] Processor Properties: Manufacturer AMD Version AMD Athlon 64 FX-55 Processor External Clock 200 MHz Maximum Clock 3700 MHz Current Clock 2600 MHz Type Central Processor Voltage 1.5 V Status Enabled Socket Designation Socket 939 [ Caches / L1 Cache ] Cache Properties: Type Internal Status Enabled Operational Mode Write-Back Associativity 4-way Set-Associative Maximum Size 128 KB Installed Size 128 KB Supported SRAM Type Synchronous Current SRAM Type Synchronous Error Correction Single-bit ECC Socket Designation L1 Cache [ Caches / L2 Cache ] Cache Properties: Type Internal Status Enabled Operational Mode Write-Back Associativity 4-way Set-Associative Maximum Size 1024 KB Installed Size 1024 KB Supported SRAM Type Synchronous Current SRAM Type Synchronous Error Correction Single-bit ECC Socket Designation L2 Cache [ Memory Modules / A0 ] Memory Module Properties: Socket Designation A0 Type DIMM Speed 50 ns Installed Size Not Installed Enabled Size Not Installed [ Memory Modules / A1 ] Memory Module Properties: Socket Designation A1 Type DIMM Speed 50 ns Installed Size 1024 MB Enabled Size 1024 MB [ Memory Modules / A2 ] Memory Module Properties: Socket Designation A2 Type DIMM Installed Size Not Installed Enabled Size Not Installed [ Memory Modules / A3 ] Memory Module Properties: Socket Designation A3 Type DIMM Installed Size 1024 MB Enabled Size 1024 MB [ Memory Devices / A0 ] Memory Device Properties: Form Factor DIMM Total Width 64-bit Data Width 64-bit Device Locator A0 Bank Locator Bank0/1 Manufacturer None Serial Number None Asset Tag None Part Number None [ Memory Devices / A1 ] Memory Device Properties: Form Factor DIMM Size 1024 MB Speed 400 MHz Total Width 64-bit Data Width 64-bit Device Locator A1 Bank Locator Bank2/3 Manufacturer None Serial Number None Asset Tag None Part Number None [ Memory Devices / A2 ] Memory Device Properties: Form Factor DIMM Total Width 64-bit Data Width 64-bit Device Locator A2 Bank Locator Bank4/5 Manufacturer None Serial Number None Asset Tag None Part Number None [ Memory Devices / A3 ] Memory Device Properties: Form Factor DIMM Size 1024 MB Speed 400 MHz Total Width 64-bit Data Width 64-bit Device Locator A3 Bank Locator Bank6/7 Manufacturer None Serial Number None Asset Tag None Part Number None [ System Slots / PCI1 ] System Slot Properties: Slot Designation PCI1 Type PCI Usage Empty Data Bus Width 32-bit Length Short [ System Slots / PCI2 ] System Slot Properties: Slot Designation PCI2 Type PCI Usage Empty Data Bus Width 32-bit Length Short [ System Slots / PCI3 ] System Slot Properties: Slot Designation PCI3 Type PCI Usage Empty Data Bus Width 32-bit Length Short [ System Slots / PCIEX16_1 ] System Slot Properties: Slot Designation PCIEX16_1 Usage In Use Length Short [ System Slots / PCIEX4_1 ] System Slot Properties: Slot Designation PCIEX4_1 Usage Empty Length Short [ System Slots / PCIEX1_1 ] System Slot Properties: Slot Designation PCIEX1_1 Usage Empty Length Short [ System Slots / PCIEX1_2 ] System Slot Properties: Slot Designation PCIEX1_2 Usage Empty Length Short --------[ Sensor ]------------------------------------------------------------------------------------------------------ Sensor Properties: Sensor Type ITE IT8712F Sensor Access ISA 290h Temperatures: Motherboard 45

Yes, both cards will work.The second card will be faster (albeit only slightly).