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Corsair DHX 4GB DDR2-800MHz

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  • phoronix
    started a topic Corsair DHX 4GB DDR2-800MHz

    Corsair DHX 4GB DDR2-800MHz

    Phoronix: Corsair DHX 4GB DDR2-800MHz

    It's been a while since last looking at any Corsair memory at Phoronix, but up for review this afternoon is their latest TWIN2X4096-6400C4DHX memory. This DDR2 memory features Corsair's DHX technology for cooling the memory ICs with EPP latencies of 4-4-4-12 and run at 800MHz. Like many other Corsair products, the TWIN2X4096-6400C4DHX is also backed by a lifetime warranty.

    http://www.phoronix.com/vr.php?view=12886

  • Nighthog
    replied
    Well the only real difference one could see clearly was in the RAMspeed tests. the 4.4.4.12 timings are really crappy if one looks there. Though there is little difference in the other tests.
    The Bandwidth test shows the 4.4.4.12 below everything else as well.

    Well I don't feel like messing and verifying right now. To add the memtest version I have in start-up grub doesn't recognise my memory correct and shows them as DDR1 memory whit wrong timings etc info. And it goes real slow compared to my other computer that actually has ddr1 memory. (though only 1Gb compared to this computers 4Gb)

    Leave a comment:


  • leef
    replied
    Originally posted by Nighthog View Post
    I have these memories for my own computer bought about 5 months back.

    I've been running them in 800Mhz 4.4.4.12.22.2T 2.1volts unganged mode.

    So should [I] after looking at these tests use the 5.5.5.18.23.2T ones instead? And try to OC them to 1066Mhz?
    I find it really odd the 4.4.4.12 are beaten by the 5.5.5.18 timings.
    I have a Phenom X4 9750 aswell
    If you're bored.

    I doubt you'll find any noticeable difference. Look at pages 4 and 5. There's only one instance showing any real difference, and that was barely 10 percent. Look at deanjo's link. You could spend two weeks adjusting the 6 memory timing parameters, the CPU speed, the memory speed, the memory voltages and then find out there are a few more memory parameters (like ganging). You'd have to benchmark them against the particular programs you use. I'd bet donuts the only item that will really matter is the CPU speed.

    Oh, and don't forget to test each combination with 24 hours of memtest and prime95 for stability.

    Please don't let any of this disuade you from the joy and reward of scientific experiment. And do report back your findings.

    Note to Michael: Even though the results are dull, the tests are very appreciated - independent verification of the manufacturer's claimed specs.

    Leave a comment:


  • Nighthog
    replied
    I'm using the Gigabyte GA-MA78GM-S2H 780G m-ATX motherboard.

    I haven't run the test suite and have no idea how to do it either right now. I did a quick look at the test suite homepage a little while back but damn was that a mess and I could not make top or bottom out off it.
    It's not something easy to get your mind to understand straight away.

    Leave a comment:


  • RealNC
    replied
    And of course Phoronix doesn't even mention the paradox of 4-4-4-12 being slower.

    Bah, why am I still looking at this site, lol.

    Leave a comment:


  • deanjo
    replied
    Originally posted by Nighthog View Post
    I have these memories for my own computer bought about 5 months back.

    I've been running them in 800Mhz 4.4.4.12.22.2T 2.1volts unganged mode.

    So should a after looking at these tests use the 5.5.5.18.23.2T ones instead? And try to OC them to 1066Mhz?
    I find it really odd the 4.4.4.12 are beaten by the 5.5.5.18 timings.
    I have a Phenom X4 9750 aswell
    What motherboard are you running? Best way to to check what timings are suited to your machine is to run the Phoronix Test Suite and compare results.

    Leave a comment:


  • Nighthog
    replied
    I have these memories for my own computer bought about 5 months back.

    I've been running them in 800Mhz 4.4.4.12.22.2T 2.1volts unganged mode.

    So should a after looking at these tests use the 5.5.5.18.23.2T ones instead? And try to OC them to 1066Mhz?
    I find it really odd the 4.4.4.12 are beaten by the 5.5.5.18 timings.
    I have a Phenom X4 9750 aswell

    Leave a comment:


  • deanjo
    replied
    Here is a article I ran across, ganged vs unganged. Very comprehensive.

    http://www.digit-life.com/articles3/...ganged-p1.html

    Leave a comment:


  • leef
    replied
    These tests show we need a better memory benchmark.

    1. The tests confirm that for most desktop applications, memory doesn't matter. There was very little difference between timings or speed.
    2. The Corsair memory was reported as 2T. The OCZ was command rate was not reported. Back when I used optimize memory, I found command rate to have significant effect on benchmark results.
    3. Memory is only part of the equation. The memory speed and latency must not just be maximized, but must be matched to the requirements of the memory controller, cache, and CPU. Running odd or fractional speeds and multipliers may look good on paper, but may not produce real world benefit.
    4. With the integrated memory controller, my Athlon64 is much more sensitive to CPU speed than RAM speed. I believe most benchmarks will reflect this. Don't know if multicores are as insensitive to memory speed. RAM speed only matters if there are significant cache misses (on the last cache). Cache speed it tied to CPU speed.
    5. As deanjo mentioned there are other memory considerations not touched upon in the article.
    6. No memory temperature measurements were taken. Minimal voltage information was reported. No power consumption figures were listed. Of course, power only matters for heat generation, since an extra watt shouldn't tax the power supply or VRM section. Voltage only matters if your motherboard isn't adjustable. But temperature might be significant. Certainly, the heat sinks got plenty of editorial space. Was temperature related to stability? Did the heat sinks work?

    I'm sure there are (server) situations where memory speed matters, but I don't know any specifically. Maybe a web server where the cgi scripts are stored in memory for quick access?

    The review whets the appetite, but doesn't quite satisfy.

    Leave a comment:


  • ChuckDriver
    replied
    Looks like the OCing (correction timing adjustment) of the modules was forcing the memory to run in unganged mode.
    I wonder if there is a benchmark that shines with improved threading where you could see the lower latency unganged memory outperform the ganged higher latency settings.

    Leave a comment:

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