Need fan help: "CPU" vs "Case" type any difference?

Hi all,

Is there any difference to what makes a cpu vs case type fan besides the fact that its strapped to a cpu heatsink instead of the chassis? Seems to me a fan is a fan, though there may be some efficiency variations.

I have two heatsinks for 478 socket: one is from my old Sony Vaio that had only a 1.7ghz p4 that is solid aluminum (bi-directional) with a working foxconn fan, and one that has the copper "core" quad-directional that came with the intel stock model (busted plastic leg) fan. I am just getting ready to put a northwood 3.2 Ghz on a 478 socket p4p800e-dlx, and since there are limited options for the 478's still for sale was wondering a couple things:

A) Could I use the VAIO fan even though its for an older cpu or are there minimums in air flow/fan speed required to support a 3.2 ghz p4 that this won't meet? OR

B) Would it be possible to somehow utilize one of these old heatsink with a new fan (like maybe some nifty uv or led variety that is the right size even though it may be called a "case" fan)? AND

c) If so, which heatsink would be better to use, solid aluminum 2-way or copper core 4-way? BUT

d) If not possible to recycle/adapt something, which of the two listed here would be best to get from Fry's:

cooler master DI4-8JD3BOL CPU COOLER
# Heat Sink Dimension 80X80X45
# Heat Sink Material Aluminum Alloy
# Fan Dimension 80X80X25
# Fan Speed 2200 10% rpm
# Fan Airflow 24.93~27.7 CFM
# Fan Air Pressure 1.57~1.95 mm H2O
# Fan Life Expectance 50000 hrs
# Bearing Type Rifle Bearing
# Voltage Rating 12 V
# Noise Level 23.2~28.2 dBA
# Connector 3 pin
# Thermal Resistance Rca 0.398 C/W
# Application Intel Prescott 3.4Ghz
# Warranty 3 years

or thermal takeTT TR2-M12 Socket- 478
# Fan Speed: 2500 +/-10% RPM
# Fan Dimension: 80x80x25 mm
# Max. Air Flow: 32.4 CFM
# Heatsink Dimension: 82x65x37.5mm
# Max. Air Pressure: 2.9 mm H2O
# Rated Voltage: 12V
# Noise: 21 dBA
# Started Voltage: 6V
# Bearing Type: Sleeve Bearing
# Rated Current: 0.14 A
# Life Expectation: 30,000 Hours
# Power Input: 1.68 W
# Connector: 3Pin


Thanks for any info on this; can't seem to find specs on the original intel stuff to compare against...