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The Truth about Temperatures and Voltages - Page 56

post #551 of 599
Quote:
Originally Posted by leppie View Post
But what I still dont understand is where TjMax can be read from.
For the Nehalem architecture MSR 0x1A2 bits 23:16, also known as the "Temperature Target" which is the "minimum" temp that PROCHOT will be activated, ie it could be a little higher than that. Sometimes referred to as Tjmax when used in the context of maximum junction temperature at which the CPU is operating within spec rather than as Tjmax used in the context of the absolute maximum junction temperature. No wonder it's confusing

AFAIK Realtemp uses MSR 0x1A2, for approximating temperature, when available. alex98uk you could check this MSR if you want to confirm, perhaps something like a cpu-z or hwmonitor dump will tell you. You might see something like

MSR 0x000001A2 0x00000000 0x00641400

where the 64 would be your target temp or Tjmax in hex. The decimal equivalent of 0x64 being 100, so Tjmax would be 100C.

Don't know about the PECI stuff as I haven't come across any PECI hardware. Maybe someone on the board has it. AFAIK it should show a running average of the hottest core from PROCHOT, or is it target temperature or Tjmax hehe. I think they are all more or less the same thing
post #552 of 599
Quote:
Originally Posted by alex98uk View Post
I'm so confused... I am running a 95c TJMax for my i7. Is that about right?
Bump. Can somebody tell us what the Tj. Max should be for the i7 920?
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post #553 of 599
That example I gave of MSR 0x1A2 was from a hwmonitor dump on the net for an i7-920 C0, so 100C.
post #554 of 599
Quote:
Originally Posted by µcode View Post
That example I gave of MSR 0x1A2 was from a hwmonitor dump on the net for an i7-920 C0, so 100C.
That's kinda what I was thinking since it's a 45nm CPU made by Intel.
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post #555 of 599
Quote:
Originally Posted by µcode View Post
AFAIK Realtemp uses MSR 0x1A2, for approximating temperature, when available. alex98uk you could check this MSR if you want to confirm, perhaps something like a cpu-z or hwmonitor dump will tell you. You might see something like

MSR 0x000001A2 0x00000000 0x00641400

where the 64 would be your target temp or Tjmax in hex. The decimal equivalent of 0x64 being 100, so Tjmax would be 100C.
Blimey, well this is what i'm getting from MSR Walker:

Code:
Start: 0x00000000 
End: 0x0000FFFF

MSR      : 63-32    31-0
----------------------------
00000000 : 00000000 000007FF
00000001 : 00000000 00000800
00000006 : 00000000 00000040
00000010 : 0000161E A271D9A2
00000017 : 00040000 00000000
0000001B : 00000000 FEE00800
0000002A : 00000000 00000000
0000002D : 00000000 00000000
0000002E : 00000000 00000000
00000033 : 00000000 00000000
00000034 : 00000000 00000024
00000035 : 00000000 00040008
0000003A : 00000000 00000005
0000003E : 00000000 00000000
0000004B : 00000000 00000002
0000008B : 00000011 00000000
0000009B : 00000000 00000000
000000C1 : 00000000 00000000
000000C2 : 00000000 00000000
000000C3 : 00000000 00000000
000000C4 : 00000000 00000000
000000CE : 00000C00 00011401
000000E2 : 00000000 00000003
000000E4 : 00000000 00000000
000000E7 : 000000A4 10D50029
000000E8 : 000000AC 446E22A4
000000FE : 00000000 00000D08
00000130 : FFFFFFFF FFFFFFFF
00000131 : FFFFFFFF FFFFFFFF
00000174 : 00000000 00000000
00000175 : 00000000 00000000
00000176 : 00000000 00000000
00000178 : 00000000 00000000
00000179 : 00000000 00001C09
0000017A : 00000000 00000000
00000186 : 00000000 00000000
00000187 : 00000000 00000000
00000188 : 00000000 00000000
00000189 : 00000000 00000000
00000194 : 00000000 00000000
00000198 : 00000000 00000015
00000199 : 00000000 00000015
0000019A : 00000000 00000000
0000019B : 00000000 00000000
0000019C : 00000000 88420000
0000019D : 00000000 00000000
000001A0 : 00000000 00850089
000001A2 : 00000000 00641400
000001A4 : 00000000 00000000
000001A6 : 00000000 00000000
000001A7 : 00000000 00000000
000001AA : 00000000 00400000
000001AC : 00000000 03700410
000001AD : 00000000 15151516
000001C6 : 00000000 00000003
000001C8 : 00000000 00000000
000001C9 : 00000000 00000000
000001D9 : 00000000 00000000
000001DB : 00000000 00000000
000001DC : 00000000 00000000
000001DD : 00000000 00000000
000001DE : 00000000 00000000
000001F0 : 00000000 00000074
000001F1 : 00000000 00000001
000001F2 : 00000000 BF800006
000001F3 : 00000000 FF800800
000001FC : 00000000 00000001
00000200 : 00000000 00000006
00000201 : 0000000E 00000800
00000202 : 00000000 BF700000
00000203 : 0000000F FFF00800
00000204 : 00000000 BF800000
00000205 : 0000000F FF800800
00000206 : 00000000 C0000000
00000207 : 0000000F C0000800
00000208 : 00000001 C0000000
00000209 : 0000000F C0000800
0000020A : 00000000 00000000
0000020B : 00000000 00000000
0000020C : 00000000 00000000
0000020D : 00000000 00000000
0000020E : 00000000 00000000
0000020F : 00000000 00000000
00000250 : 06060606 06060606
00000258 : 06060606 06060606
00000259 : 00000000 00000000
00000268 : 05050505 05050505
00000269 : 05050505 05050505
0000026A : 05050505 05050505
0000026B : 05050505 05050505
0000026C : 04040404 05050505
0000026D : 05050505 04040404
0000026E : 05050505 05050505
0000026F : 05050505 05050505
00000277 : 00070106 00070106
00000280 : 00000000 00000000
00000281 : 00000000 00000000
00000282 : 00000000 40000001
00000283 : 00000000 40000001
00000284 : 00000000 00000000
00000285 : 00000000 40000001
00000286 : 00000000 40000001
00000287 : 00000000 00000000
00000288 : 00000000 40000001
000002E0 : 00000000 00000000
000002FF : 00000000 00000C00
00000300 : 00000000 E0000001
00000301 : 00000000 000000C1
00000309 : 00000000 00000000
0000030A : 00000000 00000000
0000030B : 00000000 00000000
00000345 : 00000000 000011C3
0000038D : 00000000 00000000
0000038E : 00000000 00000000
0000038F : 00000007 0000000F
00000390 : 00000000 00000000
00000391 : 00000000 00000000
00000392 : 00000000 00000000
00000393 : 00000000 00000000
00000394 : 00000000 00000000
00000395 : 00000000 00000000
00000396 : 00000000 00000000
00000398 : 00000000 00000000
00000399 : 00000000 00000000
0000039A : 00000000 00000000
000003B0 : 00000000 00000000
000003B1 : 00000000 00000000
000003B2 : 00000000 00000000
000003B3 : 00000000 00000000
000003B4 : 00000000 00000000
000003B5 : 00000000 00000000
000003B6 : 00000000 00000000
000003B7 : 00000000 00000000
000003C0 : 00000000 00000000
000003C1 : 00000000 00000000
000003C2 : 00000000 00000000
000003C3 : 00000000 00000000
000003C4 : 00000000 00000000
000003C5 : 00000000 00000000
000003C6 : 00000000 00000000
000003C7 : 00000000 00000000
000003D0 : 00000000 00000000
000003D1 : 00000000 00000000
000003D8 : 00000000 00000000
000003D9 : 00000000 00000000
000003F1 : 00000000 00000000
000003F6 : 00000000 0000FFFF
000003F8 : 00000000 00000000
000003F9 : 00000000 00000000
000003FA : 00000000 00000000
000003FC : 00000000 00000000
000003FD : 00000000 00000000
000003FE : 00000000 00000000
00000400 : 00000000 000007FF
00000401 : 00000000 00000800
00000402 : 00000000 00000000
00000403 : 00000000 00000000
00000404 : 00000000 00000000
00000405 : 00000000 00000800
00000406 : 00000000 00000000
00000407 : 00000000 00000000
00000408 : 00000000 0000000F
00000409 : 00000000 00000000
0000040A : 00000000 00000000
0000040C : 00000000 00000003
0000040D : 00000000 00000000
0000040E : 00000000 00000000
00000410 : 00000000 00000003
00000411 : 00000000 00000000
00000414 : 00000000 0000000F
00000415 : 00000000 00000000
00000416 : 00000000 00000000
00000417 : 00000000 00000000
00000418 : 00000000 000001FF
00000419 : 00000000 00000000
0000041A : 00000000 00000000
0000041B : 00000000 00000000
0000041C : 00000000 00000007
0000041D : 00000000 00000000
00000420 : 00000000 000007FF
00000421 : 00000000 00000000
00000422 : 00000000 00000000
00000423 : 00000000 00000000
00000480 : 00DA0400 0000000E
00000481 : 0000007F 00000016
00000482 : FFF9FFFE 0401E172
00000483 : 007FFFFF 00036DFF
00000484 : 0000FFFF 000011FF
00000485 : 00000000 000401C5
00000486 : 00000000 80000021
00000487 : 00000000 FFFFFFFF
00000488 : 00000000 00002000
00000489 : 00000000 000027FF
0000048A : 00000000 0000002A
0000048B : 0000007F 00000000
0000048C : 00000F01 06114141
0000048D : 0000007F 00000016
0000048E : FFF9FFFE 04006172
0000048F : 007FFFFF 00036DFB
00000490 : 0000FFFF 000011FB
00000600 : 00000000 00000000
00000680 : 00000000 00000000
00000681 : 00000000 00000000
00000682 : 00000000 00000000
00000683 : 00000000 00000000
00000684 : 00000000 00000000
00000685 : 00000000 00000000
00000686 : 00000000 00000000
00000687 : 00000000 00000000
00000688 : 00000000 00000000
00000689 : 00000000 00000000
0000068A : 00000000 00000000
0000068B : 00000000 00000000
0000068C : 00000000 00000000
0000068D : 00000000 00000000
0000068E : 00000000 00000000
0000068F : 00000000 00000000
000006C0 : 00000000 00000000
000006C1 : 00000000 00000000
000006C2 : 00000000 00000000
000006C3 : 00000000 00000000
000006C4 : 00000000 00000000
000006C5 : 00000000 00000000
000006C6 : 00000000 00000000
000006C7 : 00000000 00000000
000006C8 : 00000000 00000000
000006C9 : 00000000 00000000
000006CA : 00000000 00000000
000006CB : 00000000 00000000
000006CC : 00000000 00000000
000006CD : 00000000 00000000
000006CE : 00000000 00000000
000006CF : 00000000 00000000
Where do I even go with that!
post #556 of 599
^^000001A2 : 00000000 00641400

Same as above, your Tjmax is 100C Your also running 8 threads, turbo off, EIST on, current multi x21 and temperature for the core you dumped was a cool 34C.
post #557 of 599
Quote:
Originally Posted by µcode View Post
^^000001A2 : 00000000 00641400

Same as above, your Tjmax is 100C Your also running 8 threads, turbo off, EIST on, current multi x21 and temperature for the core you dumped was a cool 34C.
EIST is off!

But otherwise, very clever Have a rep+.
post #558 of 599
You may have set EIST in the BIOS setup to off and that's what it's telling you but EIST is enabled. If you don't already have Realtemp and are curious, download it and check the settings button. If it shows a greyed out box next to EIST with nothing in it EIST is disabled. If it shows a greyed out box with a tick it's enabled.

Maybe your BIOS just sets all P-states the same so it doesn't really matter.
Edited by ucode - 4/15/10 at 3:27am
post #559 of 599
Ah yes, EIST is ticked... What exactly does it do? What's the difference between that and C1E?
post #560 of 599
Quote:
Originally Posted by alex98uk View Post
Ah yes, EIST is ticked... What exactly does it do? What's the difference between that and C1E?
According to my BIOS, EIST dynamically adjusts both the CPU's clock speed and voltage based on the load. C1E will reduce the CPU's power consumption when it's idling which is triggered by the OS executing the "halt" instruction.
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