Transcend JM366D643A-50

Transcend will be best known to some of our readers as a manufacturer of flash memory. While flash memory is an important product line for Transcend, they also manufacture storage products and system memory. You will not find Transcend for sale at a huge number of US websites, but Transcend also sells directly to end-users at their website. Transcend has US sites in both Spanish and English, as well as several European language sites, and Taiwan, Japan and China websites.

The 1 Gigabyte of DDR400 arrived as two separate 512MB DIMMs. Transcend packaging is very similar to that used by Kingston for their value products.

There are no heatspreaders on the Transcend CAS 2.5 DIMMs. The memory chips are labeled JetRAM, which is a name used by Transcend for their memory chips. A quick check found 1GB of Transcend CAS 2.5 selling for around $100, which is a lower price than what we normally see for a CAS 2.5 memory.


Transcend rates JM366D643A-50 at DDR400 CAS 2.5 and we found the "auto" or SPD timings to be 2.5-3-3-8.

 Transcend JM366D643A-50 (DDR400) Memory Specifications
Number of DIMMs & Banks 2 DS
Total Memory
512 MB
Rated Timings 2.5-3-3
SPD (Auto) Timings 2.5-3-3-8
Rated Voltage 2.6V

Transcend shows both DDR400 CAS 2.5 and DDR400 CAS 3 in their product list, so it is clear that the DIMM products from Transcend are aimed at the Value end of the memory market.

Test Results

Transcend JM366D643A-50 - 2 x 512Mb Double-Bank
CPU Ratio at 2.4GHz Memory
Memory Timings
& Voltage
Sandra UNBuffered Sandra Standard
Super PI 2M places
(time in sec)
Wolfenstein - Radar - Enemy Territory fps
12x200 400 DDR 2.5-3-3-6
2.6V 1T
532.0 INT 2420
FLT 2593
INT 6050
FLT 6036
82 111.9
11x218 436 DDR 3-3-3-6
2.8V 1T
529.2 INT 2593
FLT 2735
INT 6393
FLT 6309
82 111.7
Highest CPU/Mem Performance 3-3-3-7
2.8V 1T
575.5 INT 2668
FLT 2835
INT 6650
FLT 5516
75 122.5
To be considered stable for test purposes, Quake3 benchmark, UT2003 Demo, Super PI, Aquamark 3, and Comanche 4 had to complete without incident. Any of these, and in particular Super PI, will crash a less-than stable memory configuration.

Transcend is another memory that costs just $100 for a Gigabyte and yet manages to nearly reach DDR450 in overclocking. The cost and performance are very similar to the Kingston CAS 3 rated Value RAM except that Transcend rates its Value RAM at CAS 2.5. While the rated timings differ, both Kingston and Transcend both are stable at CAS 2.5 at DDR400. The Transcend RAM is an excellent value and provides the overclocking capabilities to reach a 12% CPU overclock at 1:1 memory ratio.

We have looked at Aida 32 results in the past, and found them to be very useful in examining read/write performance and memory latency. Aida 32 is now available as Everest Home Edition, a free download from

Transcend JM366D643A-50 (DDR400) 2x512Mb Double-Bank
Everest 1.51
CPU Ratio at 2.4GHz Memory Speed Memory Timings
& Voltage
Everest READ
Everest WRITE
Everest Latency
12x200 400 DDR 2.5-3-3-6
2.6V 1T
5801 1861 47.7
11x218 436 DDR 3-3-3-6
2.8V 1T
6028 1906 48.8
Highest CPU/Mem Performance
446 DDR
2.8V 1T
6306 1989 47.9

It is easy to see in the Everest results that dropping CAS just from 2.5 to 3 in moving from DDR400 to DDR436 offsets virtually all of the performance improvements that you get from higher memory speed. The $100 Transcend reaches on to DDR446 to give you most of the headroom that you need for air-cooled 1:1 overclocking at stock multipliers.

OCZ PC3200 Gold: "Value BH5" Performance Comparisons


View All Comments

  • CanadianDoc - Sunday, April 17, 2005 - link

    1 GB (2 x 512 MB) of Crucial Ballistix PC 3200 now lists for $192 U.S. at

    On any mobo, it runs at 200 MHz (DDR 400) at 2-2-2-6 timings at 2.8 V, outperforming any other RAM in this review.

    As shown by AnandTech (, on a DFI nF4 mobo, it overclocks to 280 MHz (DDR 560) at 2.5-3-3-6 timings at only 2.9 V, where it closely matches the top performance of any RAM available at any price, bar none. IMHO, this is real value.

    Adding a Venice 3200+ overclocked to 10 x 280 MHz = 2.80 GHz (, a Thermalright XP-90 heatsink with a SilenX 92mm 14dBA fan, a Seagate 7200.8 SATA NCQ hard drive, and a Gigabyte X800 XL video card with SilentPipe cooling (GV-RX80L256V), in an Antec Performance One (P160) case ( with an XG Magnum 500W heatpipe PSU (available later this month, according to, you have the makings of an ultra-quiet gaming rig with near state-of-the-art performance at a great bang-for-the-buck price.
  • ozzimark - Thursday, April 14, 2005 - link

    you can. i'm a big advocate of crucial ballistix

    speaking of that company, why were they missing from the testing too?
  • BaronVonAwesome - Thursday, April 14, 2005 - link

    195 seems a bit steep for value RAM. I'd like to point out that you can get Ballistix from Crucial for less than 210 I believe. Reply
  • Den - Thursday, April 14, 2005 - link

    Thanks for pointing out that the part numbers are on page two. As many others have said, it would have been really nice to see the best the different rams would do at 2.9v in addition to what they would do with DFI voltage. Also it would have been nice to see a greater range of memory tested but I understand you are limited by not being able to afford to buy and test what you want. Beggars can't be choosy. Thanks for doing this though, the general concept was good and there was some interesting information. Reply
  • NXIL - Thursday, April 14, 2005 - link

    Paying $100 to buy some Corsair Valueram (Newegg--had an $88 special yesterday) would have been the fair and reasonable course of action.

    Consumer Reports has been testing products fairly for decades--they don't accept advertising, and, they buy the cars, electronics, and other items they test anonymously. Of note is that "Sharper Image" has sued them recently (SI lost) when they tested one of their bogus "air purifiers"--seems to make the air less clean, actually, by releasing ozone.

    Anandtech should get some Corsair RAM and test it--and, they should buy samples of the other brands tested, and compare the "off the street" samples with the ones provided by the manufacturers. Unless I am mistaken, video card makers were found to be rigging their drivers to test better with certain benchmarks. It would not be too surprising to find that memory manufacturers had taken some of their special high cost "binned" chips and sent them out with a "value" label on them.

  • MadAd - Wednesday, April 13, 2005 - link

    Oh dear ... I left this review for 2 days till I had time to read it properly, I'm sorry to say I wish I had not bothered.

    1) Should have been titled value ram from non value companies. Wheres the real value ram?

    Since the price began to drop we seem to be up to our ears in stuff ive never heard of purporting to be cas3@3200 - Stupid me for thinking that thats what a value roundup should include, noname oem kit, not some hand selected bunch of good-but-value-priced ram from the majors.

    2) Why is the following question being avoided and ignored? Namely why wasnt any corsair memory got from another source and included in the test?

    A reader posted some assumptions however further to that it could be i) they use pretty much the same chips all over and dont want to give the game away that the extra $100 doesnt get you much increase and ii) anandtech dont want to bite the hand that feeds so bowed down to the request rather than doing whats right and finding the truth come hell or high water.

    Im not usually this negative but I do feel quite let down, sorry.
  • classy - Wednesday, April 13, 2005 - link

    I think a lot of folks are missing it. I think some people need to look at this way. You would have upgrade your cpu 1-2 speed grades to equal the performance increase that using the VX or BH5 memory would bring. Even at stock speeds. Now yes you need more voltage, but DFI I believe produces the best A64 borads as well as the best athlon XP board, Ultra B, which all are capable of supplying the necessary voltage. You can also use the ddr booster on some boards. Its a great alternative to increase system performance without spending a lot of money. And this is memory that you can grow with for at least a couple of years. I believe AMD said it won't go DDR2 until 2007. Great article, good stuff, and nice to see other ways to bring a performance increase. Nice job Wesley Reply
  • unclebud - Wednesday, April 13, 2005 - link

    84 comments in 2 days!!! haven't seen that in a while...
    thanks for the article! good reading as usual
  • XRaider - Wednesday, April 13, 2005 - link

    The cheap OCZ is faster then the Plat. Rev2 !!! Ain't dat a Bitch!!! >:-(
    WTF is up with OCZ. shooot.
  • srstudios - Wednesday, April 13, 2005 - link

    Wesley, I hate to be a nag, but now you have both the OCZ PC3200 Gold, and the OCZ PC3200 Premier with the same model number. PC3200 Gold P/NOCZ4001024ELDCGE-K
    is correct.

    The Premier should be PN- OCZ4001024PDC-K, at least I think that's the correct part.

    I have a gig of the 'old' BH-5, Mushkin Black L2 PC3500, do you think they would play nice with this new value BH-5? I don't think I would combine them, just wonder if you guys have any thoughts about it.

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