cudaMalloc failed 3!

F:\cc\pts\PtsGPUz0.2ab>PtsGPUz0.2ab.exe -o ypool.net -u aowxn -p x
PTS GPU Miner 0.2a beta 2014-01-11 by z.
Modified from jhProtominer (v0.1e).
=======================================
Launching miner...
Using 512 megabytes of memory per thread
Using 1 threads
cudaMalloc failed 3!Connected to server using x.pushthrough(xpt) protocol
xpt: Logged in with damaomao128.ptsz
New block data - height: 41478 tx count: 13
collisions/min: 0.0000 Shares total: 0
collisions/min: 0.0000 Shares total: 0

GT220 sp 48 512M
win7 64