pool.cpuchain.52hash.com doesn't give any payout. I have pending 57 CPUChain coin that doesn't send into my wallet. Avoid this CPUchain pool guys.
cpu-pool.com is a good one too, especially for small miners. 1-2 CPU as a minimum withdrawal and instant payouts. Try it out
Had a few payouts from cpu-pool.com. Minimum is 1.5 CPU, easy to accumulate even with an old pc.