Hank wrote:
>
> Thanks for the info, I meant to ask about cooling, is the heat sink already
> mounted on the cpu and what fans would be recommended for maximum coolness?
>
> So everything else looks good as far as compatibility?
>
> thanks
>
>
I'm just a rank amateur, so the things I'm commenting on, are the easy bits.
As far as I know, the FBDIMMs are "plug and play", since people have been
using them in Macintosh computers (I believe there is at least one Mac that
uses dual Xeons and has a riser card with FBDIMMs on it). As long as the people
making the FBDIMMs have been doing their homework (compliance tested them before
shipping), I would not expect them to even be as bad as unbuffered DDR2-800
in desktop systems.
The heatsink and CPU come in the same box, but are separated. If you bought a
2U chassis, such as an Intel SC2500, you would insert the CPU in the LGA771 socket,
lock it down, apply paste to the CPU, install the heatsink (screws, standoffs,
CEK spring steel thingy on bottom of motherboard etc). The fans in the 2U
chassis are right next to the heatsink, and would blow through it horizontally.
So as they say, some assembly required. Since the heatsink is separate, there
won't be a problem fitting your substitute solution for the Chenbro case. The
Swiftech cooler has the supports to hold a fan. The Intel 2U passive cooler
is, as far as I know, just a heatsink, and probably does not have any means
to hold a fan in place on top of it.
With your Chenbro, you need to find an active cooler, such as the Swiftech
ones I listed. Or look elsewhere for something that works with LGA771.
These are what I found listed on Newegg for LGA771. And the fans on these
are small and would have to work at high speed, to cool well. The Swiftech
coolers, take an 80mm fan, but the coolers are designed asymmetric on
purpose, so they can be butted head to toe. That is how the two 80mm fans
can be mounted next to one another, when the CPUs are barely a bit more
than 80mm apart.
http://www.newegg.com/Product/Produc...ubcategory=574
One of the Swiftech coolers is on Newegg, but is not listed in the LGA771
section since LGA771 was invented after the MCX604-V was designed. I think
this one is the one mentioned in the 2cpu.com thread.
Swiftech MCX604-V 80mm 2 Ball CPU Cooler
http://www.newegg.com/Product/Produc...82E16835108046
(Some comments here.)
http://www.newegg.com/Product/Produc...82E16835108046
You don't really go for "max coolness", as much as "enough coolness". There
are several temperatures you are interested in. There is the THERMTRIP
temperature, which is where the motherboard shuts off. That might happen if
the heatsink fell off, or if the fan stopped turning. There is the throttle
temperature, which might be around 70C. You want to avoid that temp, because
the processor reduces its performance, in an attempt to stay below
the throttle temp. There is nothing worse than spending money on an expensive
processor, only to have the processor reducing its execution rate.
Operating the processor cooler than that, might theoretically increase its
lifespan, but most people will have upgraded before getting close to the
lifespan. You could easily live with 50C to 60C under load, if you had to.
Looking for more coolers, this thread suggested a solution that won't cost
much. Since your processor purchase does come with a 2U passive, you can
just use nylon tie wraps to hold a fan to the top of the heatsink.
http://www.xtremesystems.org/forums/....php?p=1737272
"I just used some pull ties to attach 80mm fans to each of the 2U heat
sinks and under load the CPUs don't go past 55C. That works for me so
I put the system together and called it a day."
So that is an example of a pragmatic solution. Note that, what you are
trying to achieve with a fan, is to capture *all* the air it has to
offer. The idea is to keep the air velocity flowing through the fins,
as high as possible, so the fewer sneak paths for the air to leak
before being used, the better.
The big thing about the Verax fans mentioned in that Xtremesystems thread,
is the way the fan blades are shaped. I wish Verax would just sell their
fan blade idea to another company, so more varied products would result.
I'd like to see some case fans based on the Verax design. This article
explains why a Verax fan should be quieter than a conventional fan.
(Click the English button on the upper right...)
http://www.verax.de/verax.php?templa...id=1&entryid=7
By the way, there is a alt.comp.periphs.mainboard.tyan newsgroup, so if you
run into trouble, that is one more place you can post to. That group
isn't very high volume though.
Paul
Building this system, is it compatible? 
Linear Mode
