Crucial 8GB Kit (2x4096MB) PC3-10600/DDR3-1333 Memory Review


The introduction ...

These new Crucial 4GB UDIMM DDR3 modules were announced recently and each module has 4GB per module instead of the so far usual 2GB per module.
This capacity makes an enormously high memory upgrade possible for current High-End systems, because with e.g. 4x 4 GB modules it is possible to reach gigantic 16GB DDR3 RAM. This is fantastic for developer of 3D animations and graphic designer, but also for all other power users with a 64 bit operating system.
Two of these new Crucial PC3-10600 4GB UDIMM modules were tested as 8GB Dual Channel DDR3 kit in an AMD socket AM3 system, compared with some other RAM kits and overclocked to the maximum limit.




Thanks for the support ...

Many thanks for the support with the CT2KIT51264BA1339 8GB PC3 10600 / DDR3 1333 CL9 kit
by the manufacturer Crucial.

Click Here

The 8 GB kit contains 2x 4096 MB 240-pin DIMM DDR3-1333 modules and has a price of approx. 420 Euro (02/2010).
Memory modules are available with the upper banner in the Crucial Shop and at our sponsors.

Here you can buy Crucial 4GB DDR3 RAM



The supply of the two 4096MB PC3-10600 memory modules ...

In this antistatic plastic packing the two well protected memory modules were supplied:



That is contained in the scope of delivery ...

Crucial supplies the UDIMM memory modules like always with a quick installation guide.

The plastic packing can be opened very easy, by pressing the back to the rear, to break the two predetermined breaking points and fold up its cover. That's an exemplary Blister packaging, which can be also closed again without any problems:


Here is a picture of the quick reference guide provided to install the DIMMs and assist with problem solutions ...


Here is a picture of a CT51264BA1339.16SFA PC3-10600U-9-10-B0 4GB module without packing ...



The technical data ...

Manufacturer Crucial
Article number CT2KIT51264BA1339 bzw. 2x CT51264BA1339
Memory 8GB kit (4096MBx2)
Package 240-pin UDIMM
Type DDR3 PC3-10600
Configuration 512Meg 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 measure the RAM temperature for higher overclocking.
Alternatively one can mount a passive or active memory cooler, which are available in different versions e.g. at our sponsors like

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 D9KLV chips, whereby the assembly can vary however within production.

Here is a more detailed picture of the Micron D9KLV RAM chips:



Not 8GB during booting, but only less than 4GB in the BIOS or operating system ...

It can occur that the memory capacity is only indicated as approx. 3GB instead of the 8GB, because a 4GB or 8GB DDR, DDR2 or DDR3 RAM size or any size with more than 2GB is still a case sui generis.
Here is a guide which contains among other things a table, how much RAM is supported by the respective 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 2010c program is used for all
benchmarks, since it offers extensive adjustments and a fast result comparison.
BTW. the latest SiSoftware Sandra 2010c version is available on our download server and can be downloaded very fast.
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 743 / 1486 MHz.

Here is a Snipping screenshot of CPU-Z 1.53 with 743 / 1486 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 8GB modules reached 1486 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.

However, unofficially without bearing on the total evaluation these modules were also tested with somewhat more memory voltage. With 2.00 V maximally 752/1505 MHz could be achieved. However thereby the RAM temperature increased within a short time from approx. 38,4C at 1486 MHz with 1.5V to approx. 51,6C.
That should be already a reason for a passive or active memory cooler, because this memory temperature was measured externally with an infrared thermometer. The internal temperature of the RAM chips is thus clearly over this value.

But let us now continue with the official test, where all modules are tested with nearly the same conditions to get a better comparison to the previous tested memory modules.
With a frequency of approx. 667 MHz the SPD EEPROM autodetection timings were 9-12-12-30 2T (CAS-TRCD-TRP-TRAS).

Here is a Snipping screenshot of CPU-Z 1.53 with 666.7 / 1333 MHz and 9-12-12-30 2T:


Here are the SiSoftware Sandra 2010 benchmark results:

RAM Range
Int Buff'd iSSE2
Memory Bus Range
223 MHz * 6,66 = 1486 MHz
fix (8-8-8-24 2T)
1.53 Volt
13,12 GB/s
23,22 GB/s
78 ns
223 MHz * 6,66 = 1486 MHz
fix (8-8-8-24 2T)
1.53 Volt
13,12 GB/s
23,22 GB/s
78 ns
200 MHz * 6,66 = 1333 MHz
SPD (9-12-12-30 2T)
1.53 Volt
11,64 GB/s
20,84 GB/s
95 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:


Of course we can't expect miracles without heatspreader and without further cooling one should not increase the voltage much over manufacturer data of 1.5 V, but the result is excellent for the JEDEC standard voltage.
The two Crucial 4GB UDIMM PC3-10600 CL9 modules are with this result at 1.5 V memory voltage only a little bit below the 2GB DIMM PC3-10600 CL9 modules from Crucial and that is respectable.


Result and general impression ...

The Crucial PC3-10600 CL9 8GB RAM kit 1x CT2KIT51264BA1339 or 2x CT51264BA1339 is the so far biggest DDR3 memory kit in our review and with the capacity of 4GB per module it offers enormous upgrade possibilities.

The Crucial 4GB UDIMM modules without Heatspreader are not designed for Overclocker, but the Micron memory chips achieved good overclocking results and can be overclocked nevertheless more than 10% on the low memory voltage of 1.53V.

These 4GB DDR3 UDIMMs are a pleasure for all users who need a lot of memory in their system and they may get tears in their eyes when they see the large Micron memory chip the first time.
Graphic programs like for example Adobe Photoshop or video editing software such as Adobe Premiere supports in current versions with a 64-bit operating system enormous large files, which is however advisable only with plenty of RAM.
With the large 4GB DDR3 modules Crucial makes it possible depending upon system to upgrade it to 8GB, 16GB or more memory (as Tripple Channel kits 12GB or 24 GB) and the swap to the usually much slower hard disk or SSD is reduced while handling large files.

Concerning the price, the Crucial PC3-10600 8GB kit is still on a higher level, but it creates also undreamed-of possibilities for system upgrades and is with this good test result very recommendable for 64bit power users.


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


All pictures and article copyright 2010