That's likely high density and is not supported by your old Intel chipset. The older AMD cpus and chipset did support them which is why they are label AMD only.
The few 4Gb dimms that were Intel compatible are rather spending($60+) when you can find them.
https://www.ebay.com/p/Kingston-4-GB-DIMM-800-MHz-PC2-6400-DDR2-Memory-KVR800D2N6-4G/141719185