So managed to get some scrap freebies of hardware and gutted the cab and replaced mobo, psu, cpu and ram. Its got an enermax 350w psu and running a 3rd gen intel xeon e3-1225 v2 with 4gb ram on an msi h77ma-g43 mobo.
Considerably more powerful than the other cpus iv had in this cab and will be the final build for this cab. Igpu should be more than capable for crt shaders too. Could do with a smaller power supply in it but for free cant complain.