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6 GB of RAM for a Quadcore is really not all that much RAM, unfortunately. However, you should be able to get more than 10 frames of RAM preview. What are the dimensions of the comp that you're trying to preview, and at what quality? When you say you have 5GB dedicated, did you alter your memory usage preferences?
Just looking at a normal NTSC image at half and third quality. Yes, I adjusted the memory allocation in the program. Now, it won't preview at all because it says that it needs more than two frames selected, but my workspace is 5 sec long. Is there a memory setting directly connected to the RAM preview?
Easy to try to RAM preview layers instead of comps. That generates messages about not enough frames.
Since it is an AMD processor, have you enabled the correct compatibility settings in your BIOS for SSE and that stuff? This has often been a point of concern in the past...
If multiprocessing is enabled, remember that your 5GB of RAM is split between the different instances of After Effects, and only the foreground instance holds the RAM for the preview cache. Use the Longer RAM Preview vs. Faster Rendering slider in the Multiprocessing prefs to control how the RAM is allocated.
For more info, see the section on Memory and Multiprocesing preferences in After Effects Help.