I will first use the opportunity to direct my thanks to the owner / inventer off VapoChill - André S Eriksen - for taking time to answer all my stupid questions ( they were not few) and for his trust in my discreet use of information I got from him.
Well since I have two verified PIII450's that works flawlessly on 140MHz FSB (630MHz) I was very interested to see whether i could push them even further :) .... + 140MHz fsb is high bus speeds - and especially the quality of RAM (random acess memory) and a capable AGP card will be of outmost importance when trying to push a system past this front side bus. On the other hand - I have a extreme stable 3DBlaster 4MB PCI card at hand. The stability off the motherboard will also be of high importance.... At the time off testing I had four motherboards in house - AbitBX6r2 / AbitBH6 / Aopen AX6BC Pro Gold and AsusP3BF. I also had three types off +133 MHz RAM (128MB dimms) to choose from...
I got very dissapointed to start with --- I actually didn't get past 140MHz front side bus with the VapoChill - on any of the motherboards... Just the same speed I could achieve on AsusP3BF with a AlphaPIII cooler attached to the CPU !! .. Well - I have experimented with cooling off the bx chipset in the past ... And did something radical ... I mounted a 53watts peltier on the back off the bx chip and a 23 watt peltier on top off it ( limited space under the VapoChill CPU box ) ... Off course I had to cut out a opening in the plate behind the motherboard to mount a 60 mm fan on top off the peltier heatsink.. The fan mounted on the front peltier had to be mounted offcenter - not enough space under the CPU box.
I used the AbitBX6.rev2 motherboard flashed with the MW bios. I fired up at 143MHz front side bus / 2.4 core voltage....and after "chill" (Aseteks own program) halted the boot for 60 seconds the system went straight into windows -- 100%stable...644 MHz ... ( I have been able to adjust this CPU to 644MHz before - in windows / SoftFSB with PIII125S Alpha cooler but the system was extremely unstable - and went down after a minute or so) But now I was able to boot from scratch into windows - and 100% stable...Well -- what with 153MHz front side bus... the system beeped at my everytime I tried ... no matter how I adjusted bios settings ... "videocard beeps" In with the 4MB Creative Graphics Blaster ... and voila .... made it into windows ...that is 688.5 MHz with a PIII processor that is designed to run 450MHz
I started testing stability with CPUmark99 ... it went trough the test with no problem.. the external probe that Abit use to measure CPU temperature was steady 12' Celsius below zero - sensor mounted on the back off the cpu ! ..And temperature readings measured on the condenser - that is mounted on top off the CPU core was" the normal" minus 20' Celsius - picture - all the way through this test... My own experiences shows that CPUmark99 stresses the CPU more than CPU stability tester does - maybe because off this programs "bug" - that overflows the L2cache ... but you cannot run CPUmark99 in looped mode. CPU stability tester was thereafter started - but after less than 15 minutes the system crashed ...I tried several times with different core voltages -- same result... So I tought I should increase the cooling by combining a peltier in conjunction with the VapoChill .. But I had a problem ... my calculations indicated that the power supply would be to small to implement the peltier .. Well - I changed the power supply to a 300 watt.
The CPU didn't like this freezing business - it died after two hours off running CPU stability tester, but anyhow we managed to prove that VapoChill really have potential far beyond conventional air-cooling. Because the CPU died I have no screenshots -- I should have taken some whilst I had the chance :( ... Actually I don't think it was the 153MHz FSB that killed the CPU...it has been trough a lot off rough experiments...and sooner or later it had to die..and I think this was the time -- or did the cpu get a electric shock from peltier ??
In my opinion VapoChill and a Celeron is the perfect combination - and the prize for a VapoChill cabinet and a Celeron is about the same as a high end CPU .. And this combination will actually outperform a high end CPU in the majority off tasks ! Another great advantage with the VapoChill is that it is inexpensive to upgrade when new processors hit the market -- a owner off this genius system will always be ahead with CPU speed - we actually did run a Celeron366MHz (pga) at more than twice the default speed - 760MHz and 100% stable for several weeks . And until the opposite is proven this is the world record for C366 - we more than doubled the speed of this C366 !
Do I have anything to complain about - the cabinet which has only two 5.25 bays... the compressor that is mounted in top off the cabinet occupies so much space that three 5.25 bays is lost.. The evaporator was not polished - which would (?) improve heattransfer..but- this system is overkill anyway so actually I don't know if you will see any improvement polishing it... And I polished it before I started to use it .. so I don't know if it had any effect...Powersupply 235watts - (after I installed AsusP3BF motherboard in the VapoChill) AsusProbe indicated some strong Voltage peaks ..When I changed the powersupply to a 300 Watt and the peaks dissapeared.. These things have been discussed with Asetek .. They say there would be a another 500 kr ( $ 85 ) on the prize tag if they should have taken care off the above mentioned ... But anyway - I'm the type off guy that modifies everything I put my hands on .. and if the above was done I would have found something else to modify on this excellent and speedy solution anyway ..
And since you mentioned Kryotech - didn't you ?? J -- This is Kryotechs "customer friendly" way (taken directly from their own site) :
" Can I purchase a standalone, cooler-and-case-only version of your -40'C cooling system to upgrade my existing machine?
We currently do not offer such a product due to the
inherent complexity and motherboard-specificity of -40C cooling. Special insulation
techniques are required to prevent moisture from entering the chilled processor cavity.
This insulation is motherboard-specific, because different motherboards put different
components in different locations around the CPU. This is why we sell products like the
Cool K6-III in a barebones configuration -- we take care of all the special cooling
integration, so that our customers don't have to worry about it.
Kryotechs CoolAthlon800 versus Asetek VapoChill
David versus Goliat ?? .. I
hope you remember the end of the story !
CPU temperature in a VapoChill ..
In bios setup - it takes three minutes or so after the computer is started - and the internal cpu temperature is "not available" anymore, the bios that Asus P3B-F uses don't understand temperatures below 0' Celsius ..Same in windows - the temperature is below zero degree Celsius .. don't know excactly how far below since Asus Probe don't "understand" temperatures below zero and indicates a temperature off +250'Celsius ! The evaporator temperature is steady minus 20'C at a ambient temperature of 22' C.. We had to install Motherboard monitor that is the only utility that "understands" temperatures below zero. We have also done a test regarding the performance the little 12V compressor offers here .
Note : CPU temperature is monitored by the Asus ASIC through the CPU's internal thermal diode - PIII's / Deschutes PII / and PPGA370 Celeron all have this internal diode (slotconverter must support this feature)..
What about the cost and upgradability the VapoChill system :
I have discussed this matter with André S.
Eriksen (The Vapo man himself :) .. ) and he convinced me 100% that VapoChill is a very
600MHz "The normal Way"
Next upgrade :
Note : Flashclocking by use of liquid nitrogen and other extreme/dangerous methods : It is not flashclocking we present here - VapoChill offers safe and stable CPU acceleration. OcShoot has taken the CPUs to the limit to show you the potential which the VapoChill have. We have also gained a lot of experience the time we have had VapoChill's and you should not expect to achieve what we have done. But your results will certainly not be dissapointing !