Running fans at 17V doesnt help.....

[PeTe]

Hi everybody!
I have just tried to run fans->2x92mm Sunons-80CFM total(almost 120CFM with 17V) on my radiator at 17V but it doesn`t help to get lower temps.Where can the problem be? Is it my aluminium waterblock? Cause when I touch waterblock under heavy load it`s quite cool,so maybe there is heat transfer problem between core & water.OH!Waterblock is not from pure aluminium but from dural(not sure if this is the right name-it is alloy of aluminium+steel)...I will be getting Swiftech mcw462 wb in a week, not sure if this is good one.What do you think? thanx...

[jozzer]

What is the difference between ambient and water temps Pete?

[nitan]

hey PeTe...wot heat transfer compound are u using?

nitan :)

[PeTe]

hi nitan, I`m using artic silver II.

hey jozzer, that`s a problem....I don`t have any temp probe to measure water temps, so I really don`t know:( :( but when pushing more air through rad doesnt help I think that wb is problem, but I`m not sure...
anyway is that swiftech good or no?
thanx a lot....

[jozzer]

well...try touching the water (or container.....)for a rough guide.......Not got any kinda thermometer lying around?If the rad iss up to it, water should be within a couple of degrees of ambient....if not, it will be much higher.
What is the difference between idle temp and loaded temp.....aand finally, if you leave the pc off a while, what are the cpu temps like in the bios at first startup?
Give me all the info you can and i'll tell u where the prob is!

[nitan]

well it aint the compound then...u may wanna check thing like flow rate...from the pump and thru the rad...just a thot


nitan :)

[PeTe]

Hi Jozzer!
so here is some info: I have metal 3,5litres reservoir,when I touch it under load it seems to be as cool as any other metal part of the case....so its cool.Maybe few degrees higher than ambient but the difference is very low. At 800@1000/1.84V I`ve got these temps(they are too high I think):idling-CPU 31°C,ambient 22°C, full load-CPU 35°C.
And when I leave my comp off for a while, temp of CPU in bios immediately after start is 27°C climbing fast to 30-31°C.
hope this helps you identify my prob...

nitan, i think that flow is pretty nice, it seems that there is very little dif. between the flow of water before entering and after leaving rad....anyway if I put away hose from rad, water is pumped out from the system in few seconds(around 8-10sec).There are maybe 3-3.5 of water in the whole system.

[billg2911]

Hay Pete, Here is some Reviews on the Swiftech mcw462 :cool:

http://www.neoseeker.com/Hardware/Products/Swiftech_MCW462/reviews.html

[jozzer]

pete.....your results arn't that far wrong.....your water is prolly sitting close to room temp (maybe 24/25 degrees) and the cpu is 10 degrees higher under load!!(about right).If you change waterblock you will be lucky if you get temps down another 1 or 2 degrees.....but not much more.You could try reseating the waterblock, or work on getting the rad somewhere cooler!
35 degC is fine though.....you should be stable till 40 degrees and a few more mgz....if the cpu will take it!

[PeTe]

hi jozzer,
my cpu is stable at 800@1133/2.18V (almost 100watts of heat) but I was afraid of temps, they are 41-42°C which I consider extremely high for water cooling....what should I do when adding more powerfull(or running overclocked at 17V) fans on rad doesn`t help? I still think that my waterblock has poor heat conductivity-remember it is even not pure aluminium....when there is no diff btw. 80CFM or 120CFM through rad could it be the problem?
look at my rad,I think it`s quite big,has a lot of very fine aluminium fins and shoud be capable of handling more than 100watts from cpu,what do you think

http://mojweb.sk/petesany/comp2.jpg

[jozzer]

if its stable pete, its fine.dont be scared of temps.....unless they get to 60ish.if u change the block U gain a few degrees.....but most water kits end up around 40+cpu temps.....the water is prolly getting to around 25+, leaving 15 degrees diff between block and cpu.....at 2.1+volts, any block is going to 10degrees+(prolly 15).....so...unless tou want to blow the money for the possibility that your cpu can squeeze anoher few mgz if it is kept a few degrees cooler....hang on....what am I saying....GO FOR IT:D
ambient temp is kinda warm.....for serious improvements you need to consider chilling the water or ducting cold air to the rad.....