the 5750 is a extremely efficient card.... i think it should be ok... but you have to told us the rest of your system...or not?? if you have a modern quad core or i5, i7.... it wont... thats my opinion!
Rest of my system is:
Amd Athlon x2 5000+ 2.6ghz dual core (65 Watt)
Asus M2N-XE mobo (? Watt)
2x1 Gb kingston 800Mhz (? Watt)
320 Gb WD 7200rpm SATA HDD (? Watt)
LG DVD-RW 22x PATA (? Watt)
Radeon hd 4670 512 DDR3 (60 Watt)
(which I want to replace with hd 5750 (85W))
I dont think that those 25W whould be a problem for my psu, but need to be certan!!!