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What processors will work in SMP
- Thread starter explorer
- Start date
- Joined
- Jan 13, 2001
- Location
- Minneapolis, MN
Here's a rundown list of processors that will work in SMP:
PII Klamath core (233-333 MHz)
PII Deschutes core (300-450 MHz @ 100 MHz FSB)
PIII Katmai core (450-600 MHz)
PIII Coppermine core (550 MHz - 1 GHz)
PIII Tualatin Core - 512k cache model - 1.1-1.26 GHz
and of course Xeons based on the above processors
Celeron Mendocino core - 300-533 MHz - works in Abit BP6 and select revisions of other motherboards only.
PIV - Xeon models only - Prestonia and Foster core. 1.3 GHz+
On the AMD Side -
Duron - Morgan core (1 GHz+) works in any MP or MPX.
AthlonXP - Palomino core (1500+ model and up) - MOST work in any MP or MPX board but are not guaranteed to work in SMP and doing so voids your warranty. Some new AthlonXP's require unlocking of a L5 bridge to enable SMP. Earlier ones generally work with no additional effort.
AthlonMP - Palomino core 1 GHz and Up - guaranteed to work in SMP.
For the below processors - Most will work in 760MP chipset boards (Tyan TigerMP and Thunder K7). Will not work in 760MPX boards. These processors are not optimized for SMP and with the price of 1 GHz Morgan Durons (around $40) I cannot ever recommend using them in SMP.
Duron - Spitfire core - 600 MHz-950 MHz
Thunderbird (Athlon) - 650 MHz-1.4 GHz
SB
PII Klamath core (233-333 MHz)
PII Deschutes core (300-450 MHz @ 100 MHz FSB)
PIII Katmai core (450-600 MHz)
PIII Coppermine core (550 MHz - 1 GHz)
PIII Tualatin Core - 512k cache model - 1.1-1.26 GHz
and of course Xeons based on the above processors
Celeron Mendocino core - 300-533 MHz - works in Abit BP6 and select revisions of other motherboards only.
PIV - Xeon models only - Prestonia and Foster core. 1.3 GHz+
On the AMD Side -
Duron - Morgan core (1 GHz+) works in any MP or MPX.
AthlonXP - Palomino core (1500+ model and up) - MOST work in any MP or MPX board but are not guaranteed to work in SMP and doing so voids your warranty. Some new AthlonXP's require unlocking of a L5 bridge to enable SMP. Earlier ones generally work with no additional effort.
AthlonMP - Palomino core 1 GHz and Up - guaranteed to work in SMP.
For the below processors - Most will work in 760MP chipset boards (Tyan TigerMP and Thunder K7). Will not work in 760MPX boards. These processors are not optimized for SMP and with the price of 1 GHz Morgan Durons (around $40) I cannot ever recommend using them in SMP.
Duron - Spitfire core - 600 MHz-950 MHz
Thunderbird (Athlon) - 650 MHz-1.4 GHz
SB
- Joined
- Jun 12, 2001
- Location
- Port Charlotte, Florida
Yes, you can run chips of different speeds together. Some boards will run them at their stock speeds, other boards will run them at the speed of your choice (dont expect to put a 600Mhz chip and a 1000Mhz chip in the board and run them both at 1000!) Some won't boot at all.
As for stepping, that's just about the same story. Some don't mind it, some do. The Abit VP-6 doesn't like it, but can be fooled into running chips of different steppings.
Here is my advice...
Hand pick your chips. I will NOT run dual chips that arent the same speed and stepping. I take this one step further and won't buy chips that arent from the same lot number and more than one number apart. I will go out of my way to accomplish this. If your chips are one or two numbers apart, they are more than likely cut from the same wafer and will match each other. This is especially important in overclocking. I hear so many people saying one chip will overclock well while the other is a dog. Both of my chips successfully run at 1002Mhz (167x6) because they are sister chips (same lot #, one chip apart). If there are flaws in one chip chances are the same flaw will be on the second chip as it is yeilded from the same wafer on the same day on the same machine. And chances are your overclocking yield will be the same also.
There is a reason why they call it Symmetric Multi Processing instead of asymmetric.
As for stepping, that's just about the same story. Some don't mind it, some do. The Abit VP-6 doesn't like it, but can be fooled into running chips of different steppings.
Here is my advice...
Hand pick your chips. I will NOT run dual chips that arent the same speed and stepping. I take this one step further and won't buy chips that arent from the same lot number and more than one number apart. I will go out of my way to accomplish this. If your chips are one or two numbers apart, they are more than likely cut from the same wafer and will match each other. This is especially important in overclocking. I hear so many people saying one chip will overclock well while the other is a dog. Both of my chips successfully run at 1002Mhz (167x6) because they are sister chips (same lot #, one chip apart). If there are flaws in one chip chances are the same flaw will be on the second chip as it is yeilded from the same wafer on the same day on the same machine. And chances are your overclocking yield will be the same also.
There is a reason why they call it Symmetric Multi Processing instead of asymmetric.
- Joined
- Mar 7, 2002
- Location
- San diego or UC Davis
kingslayer is right on the stepping, it really does depend on the mobo.
The vp6 is a little pickier than most. The chips need to be same speed, have same L2 cache, and same vcore values.
Personally I don't know for sure if there are dual boards that support multiple speeds for each cpu. Ive never heard of them, but it makes sense that some should exist.
It may be possible to run 2 different cpus on a VP6 if you custom pick the speeds and vcore values. Ive never tried this, but as long as there is no error checking enabled on the board, who knows it may work.
The vp6 is a little pickier than most. The chips need to be same speed, have same L2 cache, and same vcore values.
Personally I don't know for sure if there are dual boards that support multiple speeds for each cpu. Ive never heard of them, but it makes sense that some should exist.
It may be possible to run 2 different cpus on a VP6 if you custom pick the speeds and vcore values. Ive never tried this, but as long as there is no error checking enabled on the board, who knows it may work.
- Joined
- Mar 7, 2002
- Location
- San diego or UC Davis
I just read a fact sheet off the intel web site, and it stated that no PIII's will work in SMP with diffeerent clock speeds. Even if you were to somehow change the multipler or FSB. It did say that they will still work with different steppings.
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