Crucial 4GB Kit (2x2048MB) PC3-10600/DDR3-1333 Memory Review


The introduction ...

After two high-end DDR3 RAM reviews it is again time for an inexpensive 4GB PC3-10600 CL9 kit.
The Crucial PC3-10600 4GB CL9 kit comes without heat spreader and is designed for a voltage of 1.5 V.
With this low Vmem no OC records were reached, but the result are nevertheless respectable.
All OC results and more details about the Crucial PC3-10600 4GB kit are shown in the new test report.




Thanks for the support ...

Many thanks for the support with the CT2KIT25664BA1339 4GB PC3 10600 / DDR3 1333 CL9 kit
by the manufacturer Crucial.

Click Here

The 4 GB kit contains 2x 2048 MB 240-pin DIMM DDR3-1333 memory modules and has a price of approx. 70 Euro (11/2009).
Memory modules are available with the upper banner in the Crucial Shop and at our sponsors.



The supply of the two 2048MB PC3-10600 memory modules ...

In this small box are the two well protected memory modules:



That is contained in the scope of delivery ...

Crucial supplies the two memory modules with a quick installation guide.

Here is a picture of the two well protected memory modules:


Here is a picture of the manual and both Crucial modules ...


And here is a picture of the Crucial 4GB modules without package ...



The technical data ...

Manufacturer Crucial
Article number CT2KIT25664BA1339 bzw. 2x CT25664BA1339
Memory 4GB kit (2048MBx2)
Package 240-pin DIMM
Type DDR3 PC3-10600
Configuration 256Meg x 64
Error correction NON-ECC
Speed DDR3 1333 (200 MHz * 6,66)
Voltage 1.50 Volt
Memory timing 9-12-12-30 2T (CAS-TRCD-TRP-TRAS)



Characteristics and other features ...

The memory modules are delivered without heat spreader (heatsinks), so it is necessary to keep an eye on the RAM temperature during higher overclocking.
Alternatively one can mount a passive or active memory cooler, which are available in different versions e.g. at our sponsors or
Crucial by the way grants lifelong warranty (Limited Lifetime Warranty) for the buyer. All information to manufacturer conditions are of course without guarantee by
Officially these Crucial modules are designed for the JEDEC standard voltage of 1.50 V for DDR3 modules.
The manufacturer timings and latency can be easily reached on this voltage.
By the way, the test modules were equipped with Micron D9JNM chips, whereby the assembly can vary however within production.

Here is a picture of the other Crucial modules side:



Not 4GB during booting, but only 3GB in the BIOS or operating system ...

It can occur that the memory capacity is only indicated as approx. 3GB instead of the 4GB, because the 4GB DDR, DDR2 or DDR3 RAM size or any size with more than 2GB is still a case sui generis.
Here at is a guide which contains among other things a table, how much RAM is supported by operating systems.



Benchmark values and test results ...

Let us continue with the most important part of the test report, the highest possible stable performance.
The test results are based on an ASRock M3A790GXH/128M motherboard with an AMD Phenom II 710 X3 CPU on different frequencies depending on the reference clock for the different memory benchmarks.
The multiplier adjustment remains on 13x with all frequencies, because an adjustment for the CPU in half multiplier
steps would be too inaccurate to get nearly the same CPU frequency for all tests.
Microsoft Windows 7 RC Ultimate Edition is used as the operating system.
The stability was examined with the software Memtest86 and SiSoft Sandra Lite 2009 SP3 program is used for all
benchmarks, since it offers extensive adjustments and a fast result comparison.
BTW. the latest SiSoft Sandra 2009 version is available on our download server and can be downloaded much faster.
All benchmarks are also included in the free Sandra Lite version.

First the maximum possible frequency of the memory module was determined with default 1.50 Volt (1,53V).
The memory frequency was increased in small steps with a fixed memory timing of 8-8-8-24 2T and default memory voltage, as long as the detailed memory test with Memtest86 runs without any errors.
This quite long testing time ensured that this frequency works really stable with these modules.

The highest possible frequency with 8-8-8-24 2T (CAS-TRCD-TRP-TRAS) timings and 1.53V was 750 / 1499 MHz.
If you've read both previous highend DDR3 module reviews, you already know such a frequency result, because on this low voltage the frequency was identical to the much faster modules.

Here is a Snipping screenshot of CPU-Z with 750 / 1499 MHz and 8-8-8-24 2T with 1,53 Volt:


Of course it's possible to run much higher frequencies with increased voltages or lower timings,
because the frequency values and timings depends directly from each other.
But officially Crucial specify only a voltage of 1.50 Volt without loosing the warranty.
The voltage should not be increased very much without further cooling modifications.

The benchmark comparison of all DDR3 memory modules were tested with the default 1.53 V, where these Crucial 4GB modules reached 1499 MHz.
This highest possible clocking on the default DDR3 voltage was compared now with two other settings.
On the one hand they were tested with 200 MHz reference clock x6,66 = 1333 MHz and SPD values
(SPD values are programmed in the SPD IC by the manufacturer).
On the other hand the highest possible frequency with the permitted manufacturers voltage was determined at 8-8-8-24 2T. But in case of these modules the highest voltage is identical with the lowest test voltage, so the second test is equal to the first result.

With a frequency of approx. 667 MHz the timings by SPD EEPROM autodetection were 9-12-12-30 2T (CAS-TRCD-TRP-TRAS).

Here is a Snipping screenshot of CPU-Z with 666.7 / 1333 MHz and 9-12-12-30 2T:


Here are the SiSoftware Sandra 2009 benchmark results:

RAM Range
Int Buff'd iSSE2
Memory Bus Range
225 MHz * 6,66 = 1499 MHz
fix (8-8-8-24 2T)
1.53 Volt
13,48 GB/s
23,44 GB/s
75 ns
232 MHz * 6,66 = 1499 MHz
fix (8-8-8-24 2T)
1.53 Volt
13,48 GB/s
23,44 GB/s
75 ns
200 MHz * 6,66 = 1333 MHz
SPD (9-12-12-30 2T)
1.53 Volt
11,84 GB/s
20,84 GB/s
93 ns

By the way, the "Memory Bus Range" is no benchmark value, but this value is quite simple to calculate by the frequency and
this is useful for a benchmark comparison.


Here's a diagram of the benchmark values:


Here is a direct benchmark result comparison of some DDR3, DDR2 and DDR memory modules:


The Crucial PC3-10600 CL9 kit achieved identical overclocking results with JEDEC standard voltage of 1.50 V as for example the previous tested OCZ PC3-12800 CL8 kit on 1,50V or the Lexar Media Crucial Ballistix tracer PC3-10600 CL6 kit.
At the first look this is very amazing and also very welcome on such a low price.
However, the other two DDR3 kits are provided with heat spreaders and can be operated with much higher voltages.
The last one makes it possible to increase the frequency much higher and thus also increase the performance.


Result and general impression ...

The Crucial PC3-10600 CL9 4GB RAM kit (1x CT2KIT25664BA1339 or 2x CT25664BA1339) have amazing high overclocking results and can compete on low Vmem with two high-end DDR3 kits.
But the memory voltage of the DDR3-1333 modules can not further increased according to manufacturer information.
At this point separate the wheat from the chaff in comparison to more expensive high-end modules, since these are provided with passive or active heat spreaders and allows an increasement of the important Vmem.
If a voltage increasement is out of the question anyhow, one can make a good deal with this kit, because it achieves high frequencies and fast latencies on a low memory voltage.
All in all this kit is not only interesting for OEM systems, but also for overclocking beginners.


Read on in the hardware test area with several hardware reviews ...


All pictures and article copyright 2009