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Windows 7: Choosing RAM

13 May 2011   #21
seekermeister

W7x64 Pro, SuSe 12.1/** W7 x64 Pro, XP MCE
 
 

Quote   Quote: Originally Posted by Fumz View Post
Quote   Quote: Originally Posted by seekermeister View Post
Quote   Quote: Originally Posted by ickymay View Post

no , with the advent of higher buss speeds the stable latency has generally gone up a bit with DDR3 :/

CAS latency will always mean "how many clock cycles the memory module will delay in returning a data requested by the CPU"
Okay, but to put that into perspective, with two qualified RAMS, the one with the lower CAS would be the better performing...right?
Yes. The lower the timings, the better the machine will perform.
Here's an AM3 memory link you might want to read before buying. They suggest the best kit for AM3 is cas 6 1333.
AMD AM3 Memory Performance Guide - Introduction
I scanned over the article, and while they seem to favor the 1333 memory, I didn't see anything that made it stand out as the best choice. Maybe I was scanning too fast.

One thing in those charts that confused me, was their reference to ganged or unganged memory. Does that mean the same thing as dual or single channel memory?


My System SpecsSystem Spec
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13 May 2011   #22
seekermeister

W7x64 Pro, SuSe 12.1/** W7 x64 Pro, XP MCE
 
 

Quote   Quote: Originally Posted by Glhs958 View Post
Just a question but why not newegg? I bet I have done $alot the last year threw them with only 2 or 3 doa's and rma was painless.
Yes the lower the cas is the better chip.
My reasons are personal, and not of interest to many people. They are more a matter of principle, rather than price/service that Newegg provides, therefore I don't care to delve into it.
My System SpecsSystem Spec
13 May 2011   #23
Fumz

7 Ultimate x64
 
 

Quote   Quote: Originally Posted by seekermeister View Post
Quote   Quote: Originally Posted by Fumz View Post
Quote   Quote: Originally Posted by seekermeister View Post
Okay, but to put that into perspective, with two qualified RAMS, the one with the lower CAS would be the better performing...right?
Yes. The lower the timings, the better the machine will perform.
Here's an AM3 memory link you might want to read before buying. They suggest the best kit for AM3 is cas 6 1333.
AMD AM3 Memory Performance Guide - Introduction
I scanned over the article, and while they seem to favor the 1333 memory, I didn't see anything that made it stand out as the best choice. Maybe I was scanning too fast.

One thing in those charts that confused me, was their reference to ganged or unganged memory. Does that mean the same thing as dual or single channel memory?
Yes, ganged is dual channel, unganged is single channel. In theory, as I understand it, unganged lets each core get it's own stick of RAM. It's an nVidia thing I'm not at all up on.

The thing that made cas 6 1333 stand out as the best choice was all the charts (most of them) showing it performing better... and
Quote:
Ideally DDR3-1333 memory with CAS6-7 timings would be best
My System SpecsSystem Spec
.

13 May 2011   #24
seekermeister

W7x64 Pro, SuSe 12.1/** W7 x64 Pro, XP MCE
 
 

Yes, now that I look again, I see what you mean, but in all cases, the CAS was lower than with what I have found available so far. Perhaps the edge that the 1333 ram tested CAS would have would also hold true at the higher CAS, but I don't know. With what we have found on the 1600 prices, cost is not really a factor, but there still wouldn't be a good reason to pay more for less. Yet, it still seems that there must be a good reason to opt for the 1600...I don't know...perhaps for those who overclock???
My System SpecsSystem Spec
13 May 2011   #25
seekermeister

W7x64 Pro, SuSe 12.1/** W7 x64 Pro, XP MCE
 
 

Fumz,

Quote:
Yes, ganged is dual channel, unganged is single channel. In theory, as I understand it, unganged lets each core get it's own stick of RAM. It's an nVidia thing I'm not at all up on.
Since this motherboard has an AMD chipset, where does Nvidia come into play?

EDIT: With the hardware that I currently have, there is no option to choose between dual and single channel, it does that automatically, depending on the RAM configuration in use. Has that changed with newer hardware?
My System SpecsSystem Spec
13 May 2011   #26
Glhs958

Windows 7 Ultimate 64bit
 
 

No problem I was just curious but its not really a big deal. Sometimes I learn something new when I ask. Hope I didn't offend in anyway that wasn't the intention.
My System SpecsSystem Spec
13 May 2011   #27
Fumz

7 Ultimate x64
 
 

It's not as straightforward as "more for less" if the idea is that 1333 is "less than" 1600. Yes, 1600 operates at a higher frequency than 1333; however, that does not always mean better performance.
I guess a good question is why are you choosing 1600?
My System SpecsSystem Spec
13 May 2011   #28
seekermeister

W7x64 Pro, SuSe 12.1/** W7 x64 Pro, XP MCE
 
 

Quote   Quote: Originally Posted by Glhs958 View Post
No problem I was just curious but its not really a big deal. Sometimes I learn something new when I ask. Hope I didn't offend in anyway that wasn't the intention.
No offense at all. The only reason that I don't go into detail, is because I feel that it would be a waste of time for me, and the readers, and it would cause the topic to go off in a tangent from what it is intended for.
My System SpecsSystem Spec
13 May 2011   #29
Fumz

7 Ultimate x64
 
 

Quote   Quote: Originally Posted by seekermeister View Post
Fumz,

Quote:
Yes, ganged is dual channel, unganged is single channel. In theory, as I understand it, unganged lets each core get it's own stick of RAM. It's an nVidia thing I'm not at all up on.
Since this motherboard has an AMD chipset, where does Nvidia come into play?
EDIT: With the hardware that I currently have, there is no option to choose between dual and single channel, it does that automatically, depending on the RAM configuration in use. Has that changed with newer hardware?
Like I said, I am not at all up on this. I haven't had an AMD since Conroe... but it's my (limited) understanding that this is something like, or taken from, nVidia's linked or unlinked memory setting.

Nothing changed that I'm aware of, but I don't run an AMD. Whether you run single or dual channel still depends on RAM placement, or whether you use a single stick.

What AMD does with ganged and unganged; whether you need 4 sticks to run unganged or can do it with 2; whether or not AMD has fixed the AM3 4 dimm issue... all good questions for an AMD owner, or potential AMD owner.
My System SpecsSystem Spec
13 May 2011   #30
seekermeister

W7x64 Pro, SuSe 12.1/** W7 x64 Pro, XP MCE
 
 

Quote   Quote: Originally Posted by Fumz View Post
It's not as straightforward as "more for less" if the idea is that 1333 is "less than" 1600. Yes, 1600 operates at a higher frequency than 1333; however, that does not always mean better performance.
I guess a good question is why are you choosing 1600?
Again, I'm not choosing the 1600, that is why we are conversing about this. It seemed like a good choice at the outset, simply because it appeared to be higher performing, and was somewhat more available than some RAMs of even higher timings. But, that was the entire intent of this thread, to gain insight into the best choice.
My System SpecsSystem Spec
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 Choosing RAM




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