i found this on ebay, gives details, but still not 100% sure
http://www.ebay.co.uk/itm/ws/eBayISAPI.dll?ViewItem&item=160650480180&ssPageName=ADME:X:RTQ:GB:1123
BESTEC ATX0300P5WB POWER SUPPLY UNIT
Description:
Model: ATX0300D5WB
300 watts maximum output
Single ball bearing fan design
Built-in power status LED above AC inlet
Voltage switch for 115/230V AC input
compatable with Delta DPS-300AB-24 B, Dell Vostro 200 and Mini-Tower Systems. Also for Dell Vostro models 200SFF and 400 SFF, Dell Inspiron 530 / 531.
Specification:
Model ATX-300D5WB Rev. X3
Part Number CN-0XW600
Type ATX12V
Maximum Power 300 watt
Input Voltage 100-127V-8A, 200-240V-4A
Input Frequency 50/60Hz
Output +12v 18A, +5v 22A, +3.3v 17A, -12v 0.8A, +5vsb 2A, +5v & +.3.v 160W MAX
Safty CE, N, TUV, UL E127778,
Dimensions 5.9" x 5.5" x 3.4" - Inch
Connectors ATX connector
Package Bulk pack
Cooling 80mm internal fan
Protection Built-in power status LED above AC inlet
Connectors:
ATX 2.0 24pin
ATX 2.0 24pin (x20)
ATX12V
ATX12V (x1)
SATA
SATA (x4)
Floppy
Floppy (x1)