Difference is best explained here http://www.overclock.net/t/946407/amd-motherboards-vrm-info-database but the short of it is the power phases and VRM cooling which is essential for high power CPU's like the FX 8 core. The DS3P falls in the not good 8 core group! The UD3P is newer version of the UD3 sharing the 8+2 power design and is good with 8 core.
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