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T60P Memory
T60P Memory
A technician friend of mine told me that installing 2 x 2GB in the T60p can trigger memory parity errors...that 3 GB should be installed.
Is this true?
Thanks
Is this true?
Thanks
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Re: T60P Memory
from what I know on this topic is that the T60has 32 bit os and 32 bit does not support 4gb of memory even if installed.
Your best bet in my estimation is to use 1gb + 2gb. I have heard of errors, also you wont't be utilizing the extra 1gb of memory.
Your best bet in my estimation is to use 1gb + 2gb. I have heard of errors, also you wont't be utilizing the extra 1gb of memory.
Re: T60P Memory
You're right that the T60p 32 Bit only recognizes 3GB, but some people install 2 x 2 GB anyway. But it's interesting if the installation of the additional 1 GB unutilisable RAM could trigger a parity error.Beastcloud wrote:from what I know on this topic is that the T60 is 32 bit and 32 bit does not support 4gb or memory even if installed.
Your best bet in my estimation is to use 1gb = 2gb. I have heard of errors, also you wont't be utilizing the extra 1gb of memory.
Thanks
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Re: T60P Memory
That's a load of BS.
Installing 2+2GB will make the RAM run in Dual Channel mode, ca. 5% faster than the same type RAM in 2+1GB, which would run in Single Channel mode.
That only 3GB is 'seen' is a well known fact and a hardware limitation of the T60.
Installing 2+2GB will make the RAM run in Dual Channel mode, ca. 5% faster than the same type RAM in 2+1GB, which would run in Single Channel mode.
That only 3GB is 'seen' is a well known fact and a hardware limitation of the T60.
Lovely day for a Guinness! (The Real Black Stuff)
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Re: T60P Memory
RealBlackStuff wrote:That's a load of BS.
Installing 2+2GB will make the RAM run in Dual Channel mode, ca. 5% faster than the same type RAM in 2+1GB, which would run in Single Channel mode.
That only 3GB is 'seen' is a well known fact and a hardware limitation of the T60.
The real-world performance boost of symmetric mode vs asymmetric mode is negligible for most users, usually somewhere around 0-8% increase.
Avoid parity errors and do 2+1GB
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Re: T60P Memory
Any tangible proof?Beastcloud wrote:Avoid parity errors and do 2+1GB
Lovely day for a Guinness! (The Real Black Stuff)
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Re: T60P Memory
Do you want me to reproduce one? Or link you to countless examples?RealBlackStuff wrote: Any tangible proof?
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Re: T60P Memory
hello beast....
a few examples would be nice to see..
AND, welcome to the forum..
a few examples would be nice to see..
AND, welcome to the forum..
Bill Morrow, kept by parrots & cockatoos
Sysop - forum.thinkpads.com
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She was not what you would call refined,
She was not what you would call unrefined,
She was the type of person who kept a parrot.
~~~Mark Twain~~~
Sysop - forum.thinkpads.com
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She was not what you would call refined,
She was not what you would call unrefined,
She was the type of person who kept a parrot.
~~~Mark Twain~~~
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Re: T60P Memory
Thanks, it's been a great 24 hours, not contentious at all...BillMorrow wrote:hello beast....
a few examples would be nice to see..
AND, welcome to the forum..
Intel 945 Chipset that is in the T60s is not capable of addressing more than 3GB. While the same 945 in Dell's and HP's can detect it. This isn't a chipset vs memory issue it's due to BIOS or an embedded controller in IBM's.
Moreover, to say that using 2X2GB in order to achieve dual-channel is silly. Most all modern chipsets and even that of the T60 will put 1+2GB into asynchronous dual-channel. Worst case scenario you are running single channel and receive a negligible amount of performance.
I'm making a video of using 2X2GB sticks in this T60 that I have vs 1+2GB. It's not a consistent issue but the ONLY time I have ever duplicated a Parity Error significantly, is by putting 4GB on the 945 T60's. Not T61.
Again, for the consideration of the OP using 2X2GB is of no benefit on the T60.
Re: T60P Memory
This has been discussed a lot and there are various misconceptions here. I don't mind repeating myself and others from time to time, so here goes:Beastcloud wrote:Intel 945 Chipset that is in the T60s is not capable of addressing more than 3GB. While the same 945 in Dell's and HP's can detect it. This isn't a chipset vs memory issue it's due to BIOS or an embedded controller in IBM's.
First, I'd like to point out that it _is_ a chipset issue. The 32bit memory controller in the Mobile 945 chipset is only capable of addressing 4GB. Since some of this space has to be reserved for peripheral devices, the usable physical memory will always be <4GB, no matter which vendor's machine you are using.
You said it yourself "the same 945 in DELLs and HPs can detect it". Detect does not necessarily mean "use". The T60 BIOS will also detect 4GB, IIRC, but the operating system will only be able to use 3GB.
Why exactly 3GB? That's a choice made by Lenovo. According to Intel's spec, it is the responsibility of the BIOS to configure the maximum RAM address below 4GB that is mapped to physical RAM. The rest (above it) is mapped to PCI devices. Since there are various system configurations, with different PCI devices, which may require different sizes of mapped address spaces, Lenovo chose to set this limit at 3GB to make sure that under no reasonable configuration the reserved address space will be insufficient.
I'd like to say here that I have no idea where the limit lies for other laptops using the Mobile 945 chipset.
There have been somewhat successful attempts to provide modified BIOSes for the relevant Lenovo systems, which raise the limit to 3.25 or 3.5GB. A full 4GB is not possible, and the more you raise it, the more you are likely to run into problems of being unable to allocate address spaces for PCI devices. In the end, most people concluded that the extra 256/512MB of RAM is not really adding this much performance gain to be worth the trouble.
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Re: T60P Memory
Thanks for the very lucid and definitive explanation, dr_st.
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Re: T60P Memory
Thanks Dr_St, it's more or less what I was trying to say, I've come to a lot of my own conclusions on these things, thanks for putting it down clearly.dr_st wrote:This has been discussed a lot and there are various misconceptions here. I don't mind repeating myself and others from time to time, so here goes:
First, I'd like to point out that it _is_ a chipset issue. The 32bit memory controller in the Mobile 945 chipset is only capable of addressing 4GB. Since some of this space has to be reserved for peripheral devices, the usable physical memory will always be <4GB, no matter which vendor's machine you are using.
You said it yourself "the same 945 in DELLs and HPs can detect it". Detect does not necessarily mean "use". The T60 BIOS will also detect 4GB, IIRC, but the operating system will only be able to use 3GB.
Re: T60P Memory
Thanks, Beastcloud, for your explanation as well, which additionally touched on other issues.
Re: T60P Memory
2GB+1GB = Asymmetric Dual Channel Mode (the same applies to any configuration where the DIMM sizes are not the same)
2GB+2GB = Symmetric Dual Channel Mode
2GB+empty slot = no Dual Channel Mode.
2GB+2GB = Symmetric Dual Channel Mode
2GB+empty slot = no Dual Channel Mode.
...Knowledge is a deadly friend when no one sets the rules...(King Crimson)
Cheers,
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Abused daily: T520, X200s
PMs requesting personal tech support will be ignored.
Cheers,
George (your grouchy retired FlexView farmer)
One FlexView to rule them all: A31p
Abused daily: T520, X200s
PMs requesting personal tech support will be ignored.
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Re: T60P Memory
Beastcloud wrote:
Thanks, it's been a great 24 hours, not contentious at all...
Intel 945 Chipset that is in the T60s is not capable of addressing more than 3GB. While the same 945 in Dell's and HP's can detect it. This isn't a chipset vs memory issue it's due to BIOS or an embedded controller in IBM's.
Moreover, to say that using 2X2GB in order to achieve dual-channel is silly. Most all modern chipsets and even that of the T60 will put 1+2GB into asynchronous dual-channel. Worst case scenario you are running single channel and receive a negligible amount of performance.
I'm making a video of using 2X2GB sticks in this T60 that I have vs 1+2GB. It's not a consistent issue but the ONLY time I have ever duplicated a Parity Error significantly, is by putting 4GB on the 945 T60's. Not T61.
Again, for the consideration of the OP using 2X2GB is of no benefit on the T60.
So, this guy after being called on spewing BS (by Bill no less), makes a snide remark about the forum being "contentious", then promises video proof for something specious... and never delivers. Classy guy.
So, what's the deal? Will putting 2x2gb into the T60/p cause parity errors? I bought 2x2GB (because at the end of the day, I can sell my previous 2x1GB sticks for enough that it wasn't worth buying only one stick), and one of them died like right away. Clearly, it was DOA, but now I want to know. Is 1GB+2GB definitively better than 2x2GB in my T60p? Am I going to get parity errors with 4GB installed? Where did this idea come from? Can someone corroborate?
Re: T60P Memory
skinnersbane wrote: Am I going to get parity errors with 4GB installed? Where did this idea come from? Can someone corroborate?
B S
plain and simple.
...Knowledge is a deadly friend when no one sets the rules...(King Crimson)
Cheers,
George (your grouchy retired FlexView farmer)
One FlexView to rule them all: A31p
Abused daily: T520, X200s
PMs requesting personal tech support will be ignored.
Cheers,
George (your grouchy retired FlexView farmer)
One FlexView to rule them all: A31p
Abused daily: T520, X200s
PMs requesting personal tech support will be ignored.
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Re: T60P Memory
ajkula66 wrote:
B S
plain and simple.
Alright, thanks!
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Re: T60P Memory
Well, never heard about parity error when using 2x2GB; I've been using 2x2GB in my T60 for around 3 years now and never had any issues.
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