Will i need a heatsink/ fan for this build

-Antec TruePower New TP-750 Blue 750W Continuous Power ATX12V V2.3 / EPS12V V2.91 SLI Certified CrossFire Ready
-Seagate Barracuda 7200.12 ST3500418AS 500GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
-ASUS M4A79XTD EVO AM3 AMD 790X ATX AMD Motherboard
-AMD Phenom II X4 955 Black Edition Deneb 3.2GHz Socket AM3 125W Quad-Core Processor
-G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory
-SAPPHIRE 100283L Radeon HD 5770 (Juniper XT) 1GB 128-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFireX Support
-COOLER MASTER RC-690-KKN1-GP Black SECC/ ABS ATX Mid Tower Computer Case

the 955 already comes with a heatsink/fan and my case has 3 120mm fans, and the 5770 uses low heat and has a fan as well. Think i will be okay or should i purchase a 3rd party heatsink? also ive never used thermal compound. I know the cpu most likely already has some on it but should i remove it and add my own? thank you
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More about will heatsink build
  1. If you don't plan on overclocking, you don't need an aftermarket HSF. If you do plan to overclock, I recommend getting one upfront.

    I recommend you apply AS5 as your thermal compound. Remove what may or may not be pre-installed on the heat sink and apply AS5 instead. You'll get better cooling performance by doing so.
  2. thanks. I do plan to crossfire in the future but not now. I think ill just wait on the heat sink until i crossfire. I will apply the AS5 though. is their a site with good directions or this?
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