Originally Posted by Kadombing
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).