My desktop (HP dc7800) has two 1GB DDR3 modules in it, and slot for 2 more. I tried to add (working) 2x1GB sticks of DDR2, 667, PC5300U. But got angry beeps and no boot. Any ideas?
Current memory:
*-memory:0
description: System Memory
physical id: 33
slot: System board or motherboard
*-bank:0
description: DIMM DDR2 Synchronous 667 MHz (1.5 ns)
product: 8HTF12864AY-667E1
vendor: JEDEC ID:2C 00 00 00 00 00 00 00
physical id: 0
serial: 4E351FDD
slot: XMM1
size: 1GiB
width: 64 bits
clock: 667MHz (1.5ns)
*-bank:1
description: DIMM DDR2 Synchronous [empty]
vendor: JEDEC ID:
physical id: 1
slot: XMM2
*-bank:2
description: DIMM DDR2 Synchronous 667 MHz (1.5 ns)
product: 8HTF12864AY-667E1
vendor: JEDEC ID:2C 00 00 00 00 00 00 00
physical id: 2
serial: 4D351FDD
slot: XMM3
size: 1GiB
width: 64 bits
clock: 667MHz (1.5ns)
*-bank:3
description: DIMM DDR2 Synchronous [empty]
vendor: JEDEC ID:
physical id: 3
slot: XMM4