Messages in this thread | | | Date | Sun, 5 Dec 1999 14:09:29 -0800 (PST) | From | "Mr. James W. Laferriere" <> | Subject | Re: Hyper-Sparc CPU's in Sparc20 chas.(was Re: SS-10 -> Ultra Question.) |
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Hello Robert,
On Sun, 5 Dec 1999, Robert Dinse wrote: > On Sun, 5 Dec 1999, Mr. James W. Laferriere wrote: > > Hello Robert, I tried an grunt experiment . I put Two Ross > > HyperSparc Dual 66Mhz cpu's in my sparc20 chassis & attempted > > to install RH-6.1 on the system . After several lock ups , > > and just plain funky behaviour (ie: key presses mis-interpreted) . > > I opened the case and removed the cpu's emmediately after power > > off , they were almost to hot to handle as a rough guess approx. > > 125 Deg. F. Now in my book this is way to hot for a cpu to be > > and would definately cause the flaky behaviour I (& maybe you) > > were seeing . I will later attempt to add some additional fans > > to the case & see if the added airflow helps . > > When I popped these out I dropped back in an old set of Ross > > 40Mhz Dual cpu's & started the process over , So far nothing > > ill has happened . Hth, JimL
> I am sure that's not the issue. The reason I say this is that >SunOS 4.1.4 > will run for months without a crash on the same hardware. I am not so sure this is a fair comparison . The reason I am saying this is (a while back) someone had mentioned that some instructions can have the cpu generate more heat . But, I never did hear of any proof of the concept .
Now this is in a sparc20 chassis right ?
> My main shell server here is a SunOS 4.1.4 machine on the same hardware > except that it's also got a FDDI card in the box generating additional >heat and > if I don't have to boot it for some other reason it will generally go >about six > weeks between crashes. Hmmm, this still smells of something wrong . & probably with the cpu's . IF you have put other cpu types in & the difficulties diminished or completely went away or were differant .
Fyi, sbus option cards don't put more heat on the cpu's in a sparc20 chassis . The airflow is from power supply toward the option cards . Thus the power supply gets the coolest air then the cpu's then the sbus cards . But they (of course) do draw more current . Which is another item I am worried about in the sparc20 chassis is max. current draw at rated voltage . Which if the voltage drops will cause more heat in the system .
> For what it may or may not be worth, I don't have drives in this box so > there isn't that source of heat, just the CPU's, memory, etc. I had just the one 4GB IBM sca (dchs04y) , which was warm but nowhere near as warm as th cpu's . Mine was configured as such
2) Ross Hyper-sparc 66Mhz cpu's 4) Dram simms totaling 128MB 1) Vsimm 8Mb 0) sbus options 1) 4GB IBM sca (dchs04y) HD. 1) sun 1.44 floppy .
Now I have the slower Ross cpu's in the chassis & no more heat problems air flowing out is temp nominal (afaict) , & the install is continuing un-eventful . Twyl, JimL +----------------------------------------------------------------+ | James W. Laferriere | System Techniques | Give me VMS | | Network Engineer | 25416 22nd So | Give me Linux | | babydr@baby-dragons.com | DesMoines WA 98198 | only on AXP | +----------------------------------------------------------------+
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