This PNY graphics card is one option for you if you're upgrading your computer. It has a 4 GB GDDR5 memory.
From Ecprof
VCQP1000DVIV2PB - PNY 4GB Quadro P1000V2DVI 4xmDP=>DVI Retail
Memory C
PNY VCQP1000DVIV2-PB graphics card NVIDIA Quadro P1000 V2 4 GB GDDR5
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