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Sandy Bridge DDR3 questions

post #1 of 9
Thread Starter 
1. Will 1.6-1.65V RAM work in SB

2. If I bought 8 GB of RAM would it be better for OC/stability with 2 or 4 DIMMS

3. With DDR3, how important is it to have high frequency ram over low frequency.
Edited by K3VL4R - 1/5/11 at 3:14pm
post #2 of 9
Thread Starter 
Simplified questions in OP.
post #3 of 9
1. Probably just fine.

2. No one knows for certain at this time. This is why it can suck being an early adopter.

3. See no. 2.
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post #4 of 9
Thread Starter 
Thanks.

So what would be the answer to the last two questions if we were talking about 1156 Lynnfield.

I am still looking up info on 1156 vs 1155 for memory, I suppose the most of the differences will be in how the CPU uses the memory. For now though, that comparison may be beneficial until we know just how much improvements have been made for 1155.
post #5 of 9
Sorry K3VL4R, still regarding Sandy Bridge RAM issues, can I ask here(if you're not agree I'll make a new thread):

Higher frequency RAM seems to have higher latency.
For instance, is it better to have a 8Gb with 2300Mhz CL 9-11-9-28 or a 1333Mhz CL 7-7-7-21 ?
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post #6 of 9
Thread Starter 
Quote:
Originally Posted by Kadombing View Post
Sorry K3VL4R, still regarding Sandy Bridge RAM issues, can I ask here(if you're not agree I'll make a new thread):

Higher frequency RAM seems to have higher latency.
For instance, is it better to have a 8Gb with 2300Mhz CL 9-11-9-28 or a 1333Mhz CL 7-7-7-21 ?
The more questions/discussions the better. It helps people understand more clearly. I also was wondering that what you ask, but had to simplify my questions to try and get more responses.

I figured that by finding out how much SB would improve from higher frequencies would kind of indirectly also ask how important timings were, since lower frequency memory usually accompanies lower timings as well.


Anyway, I have done some reading to answer some of my own questions. As usual, it was Anand that had my answers. So the review I went over was for LGA1366, but served well for general DDR3 research.

Aside from benching and E-Peen, there were a few instances which favoured low timings and some that favoured high frequencies and some that needed both for any improvements. For the most part, we were looking at <10% performance variable between worst and best performers in a given test, and ~5% variable overall in all tests. To make things even more moot, he stated that an extra bump in CPU OC would be more beneficial than a boost in memory performance as far as performance.

Not to say that good memory is not necessary because we all know that value is subjective when talking price/performance. One thing I did notice that most people here would probably want to know about is that in the gaming benches where there is an overall low minimum FPS across the board (ie. less than 30FPS) memory with higher timings performed poor in this area. Nothing to crazy, but 2-4 FPS lower when you are already at a low 23 FPS is going to be a lot more noticeable then gaining 2-4 FPS when you already have 100 FPS, just something to keep in mind.

Even though I have not really answered either of my last 2 questions (since the article is about LGA1366 and not SB) , I am still going to be more informed if I need to make a memory purchase any time soon. While SB may be different, the results should be the same where certain instances benefit from certain memory set ups, and there will still be a sweet spot for price/performance depending on your needs.

Now to throw in a bonus variable in here since it has come to mind is how lots of DDR3 1333 and 1600 memory has gone from expensive to dirt cheap relatively fast lately. This tells me that the manufactures are clearing house and going to start making more new stuff. While you can say " Well no ssshh", since SB and BD are on the way, this also means that they are not going to clear out the old stuff just to make more of the same.

If you can already see where this is going, then you are probably already thinking of grabbing some cheapo RAM now and then some more when the new stuff comes out later. This is great if you are like me and think this is a good year to build a HTPC box with SB and Zactate (?) coming. This way you have somewhere to toss your RAM when you upgrade.

As for what to buy (if you needed something right now) , I would say some 1600 CL9 1.5V since it is cheap. You should be able to get 1333 CL7 or something similar with it that will tide you over nicely. Who knows what the new stuff will be, if it will be better specs with a more attractive price or if they just want to put "Works with SB/BD" on the package for marketing.

Also while on the subject, don't forget about DDR2. There may be another price dive due to oversupply if most people go with DDR3 rigs in the near future. But it is inevitable that production will slow to a crawl as more and more go to DDR3 rigs, causing DDR2 to go the way of DDR(1). Just something to think about if you build/fix or just want to make some cash if you want to sit on some kits for a while (could be up to a year or more though).
post #7 of 9
Quote:
Originally Posted by Kadombing View Post
Sorry K3VL4R, still regarding Sandy Bridge RAM issues, can I ask here(if you're not agree I'll make a new thread):

Higher frequency RAM seems to have higher latency.
For instance, is it better to have a 8Gb with 2300Mhz CL 9-11-9-28 or a 1333Mhz CL 7-7-7-21 ?
It wont make to much diffrence i dont think except for benchmarks and showing off.

However, if you get 2300mhz and down clock it to 1333mhz, and then tighten the timings, the 2300 down clocked would be alot better. Still, you wont really notice it except for in benchmarks.

Thats what ive seen/read though.

Edit: I to want to know if 2 or 4 sticks are better, as i must choose from 4 x 2gb, or 2x 4gb.
2x 4gb is a bit cheaper, however if i buy 4x 2gb, i dont have to upgrade to 64bit right away.
    
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post #8 of 9
Thank you.

More than a week ago I chose to buy 1333Mhz CL9 one. So basically I clearly miss understood the writings below. Would you mind to explain what the 1333 stands for (bold). Thank you..

System Memory Support
• Two channels of unbuffered DDR3 memory with a maximum of two UDIMMs or SODIMMs (for AIO) per channel
• Single-channel and dual-channel memory organization modes
• Data burst length of eight for all memory organization modes
Memory DDR3 data transfer rates of 1066 MT/s and 1333 MT/s
• 64-bit wide channels
• DDR3 I/O Voltage of 1.5 V
• The type of memory supported by the processor is dependent on the PCH SKU in
the target platform
— Desktop PCH platforms support non-ECC un-buffered DIMMs only
— All In One platforms (AIO) support SO-DIMMs
Maximum memory bandwidth of 10.6 GB/s in single-channel mode or 21 GB/s in
dual-channel mode assuming DDR3 1333 MT/s

• 1Gb, 2Gb, and 4Gb DDR3 DRAM technologies are supported
— Using 4Gb device technologies, the largest memory capacity possible is 32 GB,
assuming Dual Channel Mode with four x8 dual ranked unbuffered DIMM
memory configuration.Introduction
12 Datasheet, Volume 1
• Up to 64 simultaneous open pages, 32 per channel (assuming 8 ranks of 8 bank
devices)
• Command launch modes of 1n/2n
• On-Die Termination (ODT)
• Asynchronous ODT
• Intel® Fast Memory Access (Intel® FMA)
— Just-in-Time Command Scheduling
— Command Overlap
— Out-of-Order Scheduling

===

It supports a maximum of two DDR3 DIMMs per-channel; thus, allowing up to four
device ranks per-channel.
DDR3 Data Transfer Rates
— 1066 MT/s (PC3-8500), 1333 MT/s (PC3-10600)
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post #9 of 9
Thread Starter 
Quote:
Maximum memory bandwidth of 10.6 GB/s in single-channel mode or 21 GB/s in
dual-channel mode assuming DDR3 1333 MT/s

DDR3 Data Transfer Rates
— 1066 MT/s (PC3-8500), 1333 MT/s (PC3-10600)
Just a bunch of basic math to beef up their specs.

PC3 10600 = theoretical bandwidth - number does not mean much
We divide that by 8 to get a speed of 1333 Mhz. (actually 7.951987997 to get 1333, and 8 would give you 1325 which close enough to relate to 1333) Now you can see how the numbers are related.

The 10.6 Ghz is just a shortened 10600 Mhz and the 21 would be approximate for the 10.6 X 2 - but again this is theoretical.

Back to the main topic, we are left with our two main specs of 1333 Mhz (speed) and the CL 9 9 9 27 (or whatever)(timings), with these timings, the lower the better/quicker. The two specs combined give you your latencies.

Another factor is the actual maker of the memory chips and their overclockabilities <- if that is a real word. (not G-skill ect. , I am talking Qimonda, etc.) This is a hidden spec that you probably will not get in the description, but from the chips themselves or from the community, like ours, where we can hear about how certain models or even batches of models can perform. Remember that kits will/should perform to their spec, while some kits will be able to achieve more than their specs better than others. This is just a bonus, and should not be of concern if your Gskill XXY will not overclock as far as another persons Gskill XXY.
Edited by K3VL4R - 1/7/11 at 5:00am
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