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DrSpirograph
n00b
Joined: 05 Apr 2003
Posts: 69
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 Posted: Tue Jul 06, 2004 11:12 am Post subject: Is /proc/cpuinfo always accurate? |
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I recently purchases a new CPU
I ordered a AMD Athlon? XP 2400+ 2.0Ghz
however, according to /proc/cpuinfo, I only have:
model name : AMD Athlon(tm) XP 1800+
stepping : 1
cpu MHz : 1515.242
It's a new motherboard too, and I haven't played with any of the settings that might over or underclock it so I would've thought it would just run at the correct speed. (And even if it didn't surely the model name would still be correct)
Before I take this up with the vendor, is there any reason that cpuinfo might be reporting the wrong info? |
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Marctraider
Guru
Joined: 24 Dec 2003
Posts: 387
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| Posted: Tue Jul 06, 2004 12:12 pm Post subject: |
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Is the bios set correct? You must set the FSB right or the multiplier.
My cpuinfo is quite accurate, when i set my FSB lower and the clockspeed decreases, cat /proc/cpuinfo will nicely detect it, i believe the kernel detects the speed at boot, look in dmesg.
Edit: actually the model name isnt 1800+ or 2400+.
The model name is just Athlon XP, as a matter of fact, i believe that if you buy a athlonxp 1800+ 1500mhz <--- the recommended speed is 1500mhz probably, for example.
Many processors run much faster then they where 'made' for, especially with AMD's, on the other side intel doesnt like overclocking the CPU much.
It also depends on the mainboard/ram if it supports such high speeds.
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spudicus
Apprentice
Joined: 05 Dec 2002
Posts: 177
Location: Geraldton, Australia
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| Posted: Tue Jul 06, 2004 2:55 pm Post subject: |
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Check the numbers on the CPU to see if they match an AXP2400 serial (See the AMD site for what they all mean). Even if they do it could have been a rebadged AXP1800.
I don't think cpuinfo is mistaken, so I'd contact the vendor. |
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jonnevers
Veteran
Joined: 02 Jan 2003
Posts: 1594
Location: Gentoo64 land
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| Posted: Tue Jul 06, 2004 5:46 pm Post subject: |
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| Code: |
blue root # cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 8
model name : AMD Athlon(tm)
stepping : 1
cpu MHz : 2004.410
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse syscall mmxext 3dnowext 3dnow
bogomips : 3956.73
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i have a Athlon XP 2400+ |
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garn
Tux's lil' helper
Joined: 10 Sep 2003
Posts: 131
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| Posted: Tue Jul 06, 2004 6:17 pm Post subject: |
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| Marctraider wrote: | Edit: actually the model name isnt 1800+ or 2400+.
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Hrmm based off jonnevers post that looks right but on my system:
| Quote: |
model name : AMD Athlon(tm) XP 2100+
cpu MHz : 1733.183
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So maybe older XP's show the "speed" in the model name? |
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Marctraider
Guru
Joined: 24 Dec 2003
Posts: 387
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| Posted: Tue Jul 06, 2004 6:52 pm Post subject: |
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O well, maybe its difference between bartons and tbirds? my tbird is really 1800+ 1.5ghz but it runs at 2400+ 2ghz, while tbirds dont go that far by normal...
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bk0
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Joined: 04 Jan 2004
Posts: 266
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| Posted: Tue Jul 06, 2004 7:09 pm Post subject: |
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Yeah, my athlon shows the speed in the model name also:
| Code: |
processor : 0
vendor_id : AuthenticAMD
cpu family : 6
model : 10
model name : AMD Athlon(tm) XP 2600+
stepping : 0
cpu MHz : 1908.887
cache size : 512 KB
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Marctraider
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Joined: 24 Dec 2003
Posts: 387
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| Posted: Wed Jul 07, 2004 2:25 am Post subject: |
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bk0, yours is a barton i assume?
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spudicus
Apprentice
Joined: 05 Dec 2002
Posts: 177
Location: Geraldton, Australia
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| Posted: Wed Jul 07, 2004 2:44 am Post subject: |
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| Marctraider wrote: | | bk0, yours is a barton i assume? |
Don't the Tbirds have 256kB of cache and the Barton's 512kB cache? |
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Rainmaker
Veteran
Joined: 12 Feb 2004
Posts: 1650
Location: /home/NL/ehv/
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| Posted: Wed Jul 07, 2004 3:00 am Post subject: |
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yep, my 2500 Barton runs at (only) 1833 Mhz...
(This scared the shit out of me when I first saw it  )
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bk0
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Joined: 04 Jan 2004
Posts: 266
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| Posted: Wed Jul 07, 2004 4:42 am Post subject: |
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| Marctraider wrote: | | bk0, yours is a barton i assume? |
Yep. I bought it as a 2.08 GHz Thoroughbred core but I'm not complaining. 
Doesn't the kernel get the CPU ID info directly from the processor? Unless there's some weird bug /proc/cpuinfo would have to be correct. |
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Marctraider
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Joined: 24 Dec 2003
Posts: 387
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| Posted: Wed Jul 07, 2004 12:07 pm Post subject: |
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Directly i believe, it detects it
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Baker
n00b
Joined: 13 Oct 2003
Posts: 49
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| Posted: Mon Jul 12, 2004 9:28 pm Post subject: |
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hey DrSpirograph the same thing happened to me.
I bought an AMD XP2400 a month ago and it is currently being run in a win xp box. A few weeks ago for no reason it now shows up as an 1800.
The BIOS used to display it as 2400 and now as 1800, same with the OS and 3rd party apps.
Did you contact the vendor? Did they give an explination?
Give us a follow up. |
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Marctraider
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Joined: 24 Dec 2003
Posts: 387
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| Posted: Mon Jul 12, 2004 9:37 pm Post subject: |
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You should check the bios settings if the FSB or something else can increase.
And also for your BIOS messages, what processor does it give? if it gives you a AXP 1800+ it's obviously a wrong BIOS setting.
(Maybe it suddenly reset?)
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MrApples
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Joined: 13 Dec 2002
Posts: 511
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| Posted: Mon Jul 12, 2004 9:52 pm Post subject: |
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| make sure the frequecy of your memory is correct to obtain standard speeds for that processor, should be 266 |
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Marctraider
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Joined: 24 Dec 2003
Posts: 387
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| Posted: Mon Jul 12, 2004 10:34 pm Post subject: |
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Mhh yes but for the other guy it just suddenly dropped back so for him that doesnt make any sence by then :)
Unless he replaced the memory or such.
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_dook_master_
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Joined: 16 Sep 2003
Posts: 295
Location: Isla Vista, CA
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| Posted: Mon Jul 12, 2004 11:00 pm Post subject: |
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| I'm hoping you guys know that even though its called a 1800+, 2500+, that it doesn't really run at that speed? Thats just a PR rating, its comparison to an equivalent Intel CPU. |
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MrApples
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Joined: 13 Dec 2002
Posts: 511
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| Posted: Mon Jul 12, 2004 11:26 pm Post subject: |
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| _dook_master_ wrote: | | I'm hoping you guys know that even though its called a 1800+, 2500+, that it doesn't really run at that speed? Thats just a PR rating, its comparison to an equivalent Intel CPU. |
yes that was previously mentioned, but his is being misidentified |
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Marctraider
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Joined: 24 Dec 2003
Posts: 387
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| Posted: Mon Jul 12, 2004 11:39 pm Post subject: |
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And it also matters if its a Barton or a tbird.
A Tbird 1800+ should be 1.5ghz but a barton 1800+ should be faster or slower afaik in Ghz.
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RAM: DDR2 OCZ 4GB
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SATA: 3x 250GB. |
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spudicus
Apprentice
Joined: 05 Dec 2002
Posts: 177
Location: Geraldton, Australia
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| Posted: Tue Jul 13, 2004 4:29 am Post subject: |
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| Marctraider wrote: | And it also matters if its a Barton or a tbird.
A Tbird 1800+ should be 1.5ghz but a barton 1800+ should be faster or slower afaik in Ghz. |
AMD don't make a Barton 1800+. Barton's start at 2500+:
http://www6.tomshardware.com/cpu/20030210/barton-09.html
The main difference between Palomino's, Thoroughbreds and Bartons isn't their Mhz but their FSB and Cache. |
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Marctraider
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Joined: 24 Dec 2003
Posts: 387
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| Posted: Tue Jul 13, 2004 9:24 am Post subject: |
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No but you could always downclock it, its more about the difference between barton and tbird. not how fast they can go ;)
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MrApples
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Joined: 13 Dec 2002
Posts: 511
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| Posted: Tue Jul 13, 2004 3:58 pm Post subject: |
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| Marctraider wrote: | No but you could always downclock it, its more about the difference between barton and tbird. not how fast they can go  |
if this was a matter of underlocking i wouldnt be impressed |
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bk0
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Joined: 04 Jan 2004
Posts: 266
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| Posted: Tue Jul 13, 2004 6:58 pm Post subject: |
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TBird is the old non-XP Athlon.
Athlon XP's are either Barton or Thoroughbred. Barton's have more L2 cache and/or faster FSB so for a given performance number they run at a lower clockspeed.
2600+ (Barton) = 1.9 GHz
2600+ (Thoroughbred) = 2.08 GHz |
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SkaMike
n00b
Joined: 12 Jul 2004
Posts: 25
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| Posted: Tue Jul 13, 2004 8:57 pm Post subject: |
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Here's a good link:
[url]http://139.95.253.214/SRVS/CGI-BIN/WEBCGI.EXE/,/?St=2,E=0000000000168427370,K=2025,Sxi=17,Case=obj(1224)[/url]
You should manually set your bios according to that. Just verify the numer on your CPU with that table
+-15 or so MHz within the nominal value is accurate. They usually very slightly. It says my Thoroughbred 2400+ running at 2156 MHz (stable) and is a 2700+ (after overclocking). My FSB is set at 166 and the multiplier is 13. 13 * 266 = 2158 which is close to the actual frequency.
And AMD labels their chips higher than their actual MHz. I guess its how fast it is compared to a Pentium running at that frequency. Although a 1800+ runs at 1533MHz, its supposedly as fast as a Pentium 1.8 GHz processor.
You can read about that here:
[url]http://139.95.253.214/SRVS/CGI-BIN/WEBCGI.EXE/,/?St=15,E=0000000000168428808,K=2025,Sxi=17,Case=obj(3511)[/url]
Sorry about the long links, I couldn't get it to work in the URL=http://... form.
Hope this helps.  |
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Marctraider
Guru
Joined: 24 Dec 2003
Posts: 387
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| Posted: Tue Jul 13, 2004 9:20 pm Post subject: |
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| bk0 wrote: | TBird is the old non-XP Athlon.
Athlon XP's are either Barton or Thoroughbred. Barton's have more L2 cache and/or faster FSB so for a given performance number they run at a lower clockspeed.
2600+ (Barton) = 1.9 GHz
2600+ (Thoroughbred) = 2.08 GHz |
Oh ofcourse, i am always confused with Thoroughbred and Thunderbird (Tbird and tbred)
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CPU: E6400 Conroe
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