cpu upgrade

  • Thread starter Thread starter Jim McConaughey
  • Start date Start date
J

Jim McConaughey

I've just upgraded the cpu from an Athlon XP 2100 to an Athlon XP 2700.
Windows still shows that I have a 2100. I've tried removing it from device
manager and restarting, but it still comes up with a 2100. Computer seems
to be running fine, but is there a way to get Windows to recognize this new
CPU?

Thanks!
 
Jim said:
I've just upgraded the cpu from an Athlon XP 2100 to an Athlon XP
2700. Windows still shows that I have a 2100. I've tried removing it
from device manager and restarting, but it still comes up with a
2100. Computer seems to be running fine, but is there a way to get
Windows to recognize this new CPU?

Thanks!
Click to expand...

Are you sure you have it correctly set up in the BIOS? Windows gets the CPU
speed from the BIOS. 2100 is 1.73GHz, IIRC and 2700 is 2.08GHz - *BUT* the
2100 has a bus speed of 266, whilst the 2700 is 333 - you may need to
upgrade your RAM. I'm sure someone will correct me if I'm incorrect but,
whilst you can run a 2100 with PC2700 (333MHz) RAM, you cannot run a 333 bus
CPU with 266 RAM. You will need to have the BIOS set thusly in order for it
to be recognised correctly - *DO NOT ATTEMPT THIS IF YOUR RAM ISN'T UP TO
SPEED*!!!

166(FSB)x12.5(multiplier) = 2.083GHz

2100 = 133x13=1.73GHz

Now, if you were to attempt to run a 2700 at 266MHz you'd be forced to
underclock the CPU as 2083/133 = a clock speed of 15.66 and, whilst there
may be some overclockers boards (ABIT for example) that may allow a clock
setting of 15.66, most boards allow whole or halves only. You could, I
suppose, set the clock to 15 and leave the FSB at 133 and run the CPU as a
2400 (the highest speed with an FSB of 266), but that rather defeats the
object...

What is it recognised as at boot?

I may, of course, be talking out my behind here...
 
It is not so much a question of whether XP sees it as a 2700 as the system
seeing it for what it is.. Does the initialization screen report it as a
2700?.. when replacing it, did you alter jumpers or dip switches?.. or does
your mobo auto recognize?..
 
| I've just upgraded the cpu from an Athlon XP 2100 to an Athlon XP 2700.
| Windows still shows that I have a 2100. I've tried removing it from
device
| manager and restarting, but it still comes up with a 2100. Computer seems
| to be running fine, but is there a way to get Windows to recognize this
new
| CPU?
|
| Thanks!
|
|

Hi Jim -

Your old processor had a 133MHz (266MHz double data rate) Front Side Bus
and, using a multiplier of 13, resulted in a processor speed of
approximately 1733MHz (or an XP 2100+ model).

Your new processor has a 166MHz (333MHz double data rate) Front Side Bus
and, using a multiplier of 13, results in a processor speed of approximately
2167MHz (or an XP 2700+ model).

Does your motherboard support a 166MHz (333MHz double data rate) Front Side
Bus? If it does, you either need to reset your processor speed in your BIOS
or change a jumper on your motherboard.

Then there's the whole issue of your memory. If you have PC2100 Memory,
which has a 133MHz (266MHz double data rate) Front Side Bus and your
motherboard cannot run your processor at a different speed from your memory,
your system will be unstable because you will be overclocking your memory.
If you have PC2700 (which has a 166MHz (333MHz double data rate) Front Side
Bus) or faster memory, you'll be fine - again, if your motherboard supports
a 166MHz Front Side Bus.

Check AMD's Support page for more information: http://tinyurl.com/qknc

Jef
 
Jef said:
Hi Jim -

Your old processor had a 133MHz (266MHz double data rate) Front Side
Bus and, using a multiplier of 13, resulted in a processor speed of
approximately 1733MHz (or an XP 2100+ model).

Your new processor has a 166MHz (333MHz double data rate) Front Side
Bus and, using a multiplier of 13, results in a processor speed of
approximately 2167MHz (or an XP 2700+ model).

Does your motherboard support a 166MHz (333MHz double data rate)
Front Side Bus? If it does, you either need to reset your processor
speed in your BIOS or change a jumper on your motherboard.

Then there's the whole issue of your memory. If you have PC2100
Memory, which has a 133MHz (266MHz double data rate) Front Side Bus
and your motherboard cannot run your processor at a different speed
from your memory, your system will be unstable because you will be
overclocking your memory. If you have PC2700 (which has a 166MHz
(333MHz double data rate) Front Side Bus) or faster memory, you'll be
fine - again, if your motherboard supports a 166MHz Front Side Bus.

Check AMD's Support page for more information: http://tinyurl.com/qknc

Jef
Click to expand...

Jef,

Thanks for noticing my mistake - I had it as a 2600, not a 2700!
 
| Jef,
|
| Thanks for noticing my mistake - I had it as a 2600, not a 2700!
|
|
| --
| Perdita X. Dream
|
| Please help us to help you
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|

Perdita -

Actually I was off getting the link from AMD and writing my response when
you posted. I only glanced at your post after mine appeared and said to
myself "well, at least Jim's getting the same diagnosis twice..." ;-)

I wouldn't even have noticed that you mentioned a different multiplier had
you not brought the matter up (I wasn't quibbling, in other words).
Initially I wasn't certain that both chips have a 13x multiplier - so I went
to AMD to look before I wrote.

In any event, I've seen this problem often - especially with motherboards
that don't support a 166MHz FSB.

Jef
 
Jef said:
Perdita -

Actually I was off getting the link from AMD and writing my response
when you posted. I only glanced at your post after mine appeared and
said to myself "well, at least Jim's getting the same diagnosis
twice..." ;-)

I wouldn't even have noticed that you mentioned a different
multiplier had you not brought the matter up (I wasn't quibbling, in
other words). Initially I wasn't certain that both chips have a 13x
multiplier - so I went to AMD to look before I wrote.

In any event, I've seen this problem often - especially with
motherboards that don't support a 166MHz FSB.

Jef
Click to expand...

Well thanks for proving I do (very occasionally!) know what I'm on about!
;o)
 
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