Absolutely; NTLM has been attackable for ages. Running on a Quad core machine it can be cracked in a reasonable amount of time.

The cost/time trade-off for such cracking makes this rig pointless for such cracking, unless you absolutely must have it in 6 minutes.

I don't see any other major use for this; it's simply not powerful enough to attack anything new (Edit: even with 128, rather than 25, GPU's).