How good is my water-cooling rig?

I hope you folks can help with this. I home-built a water-cooling
rig for the setup you see in my Sig. I used a Maze-3 WB to cool
just the CPU, but made all the rest myself, with some help from
a friend with a table saw. What I'm wondering is - how good a
job did I do?

The CPU is a T-Bred B 1700+ DLT3C (1.5v) JIUHB 0310 XPMW
running at 1.5v, 2240 Mhz (140 * 16 - can't get over 140 FSB at
any multiplier with this board). With a room-temp of 23C the
CPU-temp is 33C as I write this (easy load). I can pretty well
trust these numbers as accurate, since they are taken from a
set of Lian Li digital temp probes.

Now, if I understand how to figure the C/W of any cooling setup
from some of Bill Adams articles, then: Delta / CPU Wats = C/W.
In other words, the CPU-temp minus the room-temp divided by
the heat dissipation of the CPU in Watts = C/W; a measure of
efficiency of the whole setup.

I know the Delta-temp is 10C, but what I can only guess at is
the CPU wattage. I found a tech-doc on AMD's site that gives
a set of numbers for the 3 speed-grades of this 1.5v chip.

CPU Mhz Max Incr. Typical Incr.
1700+ 1467 49.4 - 44.9 -
1800+ 1533 51.0 +1.6 46.3 +1.4
1900+ 1600 52.5 +1.5 47.7 +1.4

So, heres the big question: given that I'm running at 2240 Mhz
(still 1.5v) or 11.6 "speed-grades" over the stock 1700+ speed,
how many watts is this puppy pumping out? I'm sure that the
increment per speed-grade can't decrease as speed increases,
and I doubt that is even stays on a "straight-line". Beyond that,
I'm clueless. Can anyone help with this?

You have a 1700+ running at 2240Mhtz, and at 33C idle?
Sounds like you have it whooped to me! Impressive!

As for the wattage curves, I have no idea. It's my opinion that we can only guess at wattage in any given chip anyway because of the variety in manufacturing. The only thing I'd trust to measure C/W is BillA's setup (or the one coming soon to Ed). That's the only to truly tell the wattage of heat given off at the die. Everything else is just as accurate as lawn darts (guessing).

By the way, because I know someone's gonna say this, it's true the voltage wasn't changed, but the amperage it consumes has, thus increasing the wattage.

Thanx Diggrr; (sigh) I suppose I'll have to be content with guessing.

So, if I GUESS the CPU wattage increases on a straight-line, then
that comes to about 61 watts @ 2240, which gives me a C/W of
about .165!?! Its just real hard to believe that I've outdone the
best commercial kits with my first try at this - I really am a noob
at water-cooling.

Well; actually this is (sort of) my 2nd try - but that's a story of a
lesson learned the hard way.

PICS!!!
Did you use a home made wb? if not wich one? Looks like you did a good job but I am still a sorta n00by so I don't know all the watts junk.

Sounds good - post pics!

A friend of mine has the exact same processor at 2.35 ghz, 1.7V with a Vantec Aeroflow. You should be able to get at least 2.5 ghz out of yours with 1.85V.

Thanx Giblet Plus! I'll try to post some pics when I can find them - they're on a CD somwhere.
I recently did a complete "vital-organ transplant" on my PC and when I installed Win-XP,
it formatted BOTH of my H/D's - lost all files, many irreplaceable!!
Next time I'll be sure Everything is backed up on CD's.

I used a Maze-3 coppper-top W/B from Danger Den, but designed and built the rest myself.
Everything is in an external wooden box; the only thing inside the case is the water-block.
Used a '68 Mustang heater core, with 2 x 120 mm fans shrouded in a push-pull setup.
I'm using a Hydor L30 pump with a 4-inch sq. plastic electrical junction box for a
reservoir. The PC sits atop the box and I cut a hole in the case for the water lines.

I don't know about 2.5 Ghz, but I'm hoping to hit 2.4 with a better mobo.
I'm pretty sure this one is what's holding me back from anything over 140 FSB!

That board shouldn't be holding you back too much, and I can hit 2.5 with my 1700 on air...go for it!

Hi Altec - I'm definitely gonna go for all I can get out of it; but not sure just
how right now. Mebbe you & others can help me figure that out.

My mobo is an Asus A7V8X with ver 1010 BIOS; Ram is 1 Corsair 256 MB
PC-3500 (so I doubt the Ram is the culprit). When I started off, I just set
the board to 166 FSB at std mult. That ran OK until I fired up 3dMark2001.
It crashed in the first 5 seconds of the car chase - not good.

So, I backed off to 133 FSB and started on the multiplier and got up to 16x
stable, then started creeping up the FSB again. 140 is as fast as it would
go. I haven't really tried too hard yet with increasing voltages, since it
hit that FSB wall.

Should I try a later BIOS? How far can I "get away" with upping voltages?
Any good advice would be appreciated.

Just to give some reference.... I have the same CPU, 1700 DLTC3 XPMW 0310. Cooling and specs in sig. Oh and my machine is at LOAD folding, 24/7/365 so I can't give you any 'idle' temps

Greywood, I sent you a PM about your overclock, hope I can help.

Yes, altec - that was very helpful - thanks. I'm now running at:
175FSB * 14 = 2450 Mhz with tightest RAM timings the board will
let me set. Had to boost voltages: CPU 1.7 (board limit again)
VGA 1.7 and RAM 2.75. Seems stable for now, but I still
need to "punish" it at high load for a few hours to be sure.

nikhsub1 - Thanks for the feed back. I'm running 36 C (idle) to
40C (looping 3dMark) with this O/C. Judging from the numbers
you're showing, I'm at least "in the ball-park".

I know I'm very happy with this setup - when I couldn't get over
an 11% O/C with my old setup, this 67% O/C feels (almost) like
hitting the lottery!

Glad I could help...

Sandra has an estimater. It must take in to account wattage b/c my 1700+ @1.96v said something like 90 watts. I got a .1xx C/W myself. Yesterday being my first watercooled PC.

Uhmm you should run mprime or cpu toast to get the "full load" temp, C/W is always over "full load" temps, I'm getting about 19ºC over ambient temp with 2x 2400XP + GeForce Ti 4400, that's about a C/W of 0.12 if I take out a processor I get about 10º over ambient at full load.

Regards,

- german

texuspete00 - do you recall which Sandra module has that estimater?
Nothing obvious popped out at me.

kahuna0k - yeah, I plan on running some serious full-load torture
programs
for several hours before calling this puppy fully stable (one crash and its
aw-**** back to the drawin' board) ;>)