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[Anandtech] Memory scaling on haswell

post #1 of 19
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Quote:
‘How much does memory speed matter?’ is a question often asked when dealing with mainstream processor lines. Depending on the platform, the answers might very well be different. Similar to our comparisons with Ivy Bridge, today we publish our results for 26 different memory timings across 45 benchmarks, all using a G.Skill memory kit.

In our previous memory scaling article with an Ivy Bridge CPU, the results of memory testing between DDR3-1333 to DDR3-2400 afforded two main results – (a) the high end memory kit offered up to a 20% improvement, but (b) this improvement was restricted to certain memory limited tests. In order to be more thorough, our tests in this article take a single memory kit, the G.Skill 2x4GB DDR3-3000 12-14-14 1.65V kit, through 26 different combinations of memory speed and CAS latency to see if it is better to choose one set of timings over the other. Benchmarks chosen include my standard array of real world benchmarks, some of which are memory limited, as well as several gaming titles on IGP, single GPU and multi-GPU setups, recording both average and minimum frame rates.

The Problem with Memory Speed

As mentioned in the Ivy Bridge memory scaling article, one of the main issues with reporting memory speeds is the exclusion of the CAS Latency, or tCL. When a user purchases memory, it comes with an associated number of sticks, each stick is of a certain size, memory speed, set of subtimings and voltage. In fact the importance of order is such that:

1. Amount of memory

2. Number of sticks of memory

3. Placement of those sticks in the motherboard

4. The MHz of the memory

5. If XMP/AMP is enabled

6. The subtimings of the memory

http://www.anandtech.com/show/7364/memory-scaling-on-haswell
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post #2 of 19
Thank you for posting this. I just searched for a review like this a few hours ago and I came up empty.
post #3 of 19
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Originally Posted by Derp View Post

Thank you for posting this. I just searched for a review like this a few hours ago and I came up empty.

Ian only put it up a few hours ago, lucky you biggrin.gif
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post #4 of 19
and this when the next year are coming Haswell-E with DDR4 tongue.gif
post #5 of 19
Ram prices seem to have raised even more since he checked on the 17th..... I can't seem to find anything that match up with his prices.

Please make it stop! I wish I could go back and buy a boat load of that samsung ram for those amazingly low prices.
post #6 of 19
i was just going to post this until i saw its here already, nice job!
Quote:
Haswell Recommendations

For discrete GPU users, recommending any kit over another is a tough call. In light of daily workloads, a good DDR3-1866 C9 MHz kit will hit the curve on the right spot to remain cost effective. Users with a few extra dollars in their back pocket might look towards 2133 C9/2400 C10, which moves a little up the curve and has the potential should a game come out that is heavily memory dependent. Ultimately the same advice also applies to multi-GPU users as well as IGP: avoid 1600 MHz and below.

yeah i am cheating by just reading the conclusion since my interest is more for helping someone with a recommendation that actually using/needing the info. so with that said, it seems sandy/ivy do well with 1600 a little better with 1866 but not all that great with faster (considering the price/performance). haswell makes better use of 1866 and gets hampered by 1600.

so does this mean if using sockets 1155/1150 going for 1866 ram should cover it all? ( i am NOT asking for benchmarking, obviously)
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post #7 of 19
Quote:
Originally Posted by Derp View Post

Ram prices seem to have raised even more since he checked on the 17th..... I can't seem to find anything that match up with his prices.

Please make it stop! I wish I could go back and buy a boat load of that samsung ram for those amazingly low prices.

Check camelcamelcamel.com for price graphs of kits on Amazon over time like in the review, it's actually quite handy thumb.gif The prices listed in the review are the cheapest prices for kits on Newegg, so if you want a different colour heatsink or tighter subtimings, prices will be different.
post #8 of 19
so... where ivy bridge generally maxed out around 1600... haswell seems to basically max out around 1866... there are some gains to be had at higher levels but they're mostly for the igpu.

about what i expected. there is a different bottleneck in an intel system... cause right now memory speed seems to have a negligable impact on anything. I suspect the reason why ram speeds have such little practical impact on intel cpus is because of all that high quality L3 cache they sport.
 
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post #9 of 19
who plays on 1360x768-most still rocking 1920x1080 ,why is this test ren only @ stock CPU ? (there should be larger gains @ higher clock 2cents.gif )

looks like 2400c9 is still best bang for you $



P.S. testing SS vs DS not fair ..few more 2cents.gif (pretty sure that the kit pictured in OP are single sided Hynix and it shows in the graph)
Edited by coolhandluke41 - 9/26/13 at 6:52pm
    
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post #10 of 19
There was a fire at the Hynix plant early this month. I think the price increases are starting to cascade down the supply chain.
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