There is an upper limit on resolution above which the render doesn't start, it hangs and the CPU load peaks. It seems to be somewhere around 6 megapixels on Win7. When i was using flam4 on WinXP 32bit the highest resolution i could render was around 20 Mpixels.
AMD Athlon 64 X2 Dual Core 3800+, Win7 64bit, 2 GB RAM, GeForce 8800 GTS 512 (G92, comp. capability 1.1) 512 MB, Nvidia driver 257.21
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