Pixel Bender - RAM Requirements

Question

I'm new to using Pixel Bender. I've opened an image and am trying to apply the filter but keeping getting the message that it can't process it due to insufficient memory (RAM). I've tried resizing the image down considerably, but still get the same message. I am using and iMac with the following profile. Can someone help me understand what I need to do to use Pixel Bender? Thanks. 
Model Name:
iMac
  Model Identifier:
iMac8,1
  Processor Name:
Intel Core 2 Duo
  Processor Speed:
3.06 GHz
  Number Of Processors:
1
  Total Number Of Cores:
2
  L2 Cache:
6 MB
  Memory:
4 GB
  Bus Speed:
1.07 GHz
  Boot ROM Version:
IM81.00C1.B00
  SMC Version (system):
1.30f1
  Serial Number (system):
  Hardware UUID:
NVIDIA GeForce 8800 GS:
  Chipset Model:    NVIDIA GeForce 8800 GS
  Type:    GPU
  Bus:    PCIe
  PCIe Lane Width:    x16
  VRAM (Total):    512 MB
  Vendor:    NVIDIA (0x10de)
  Device ID:    0x0609
  Revision ID:    0x00a2
  ROM Revision:    3234
  Displays:
iMac:
  Resolution:    1920 x 1200
  Pixel Depth:    32-Bit Color (ARGB8888)
  Main Display:    Yes
  Mirror:    Off
  Online:    Yes
  Built-In:    Yes
L226W:
  Resolution:    1440 x 900 @ 75 Hz
  Pixel Depth:    32-Bit Color (ARGB8888)
  Mirror:    Off
  Online:    Yes
  Rotation:    Supported

Answer 1

That error tends to be a bit of a catch-all error sadly so it does not necessarily mean you are running out of memory. I would expect the Pixel Bender plugin to work reliably on your graphics card. What are the dimensions, in pixels, of the images you are processing? Please create a 512x512 pixel image and try processing it in the Pixel Bender plugin.