OCZ 2GB Reaper HPC Edition Kit (2x1024MB) PC2-8500/DDR2-1066 Memory Review


The introduction ...

Today, ocinside.de published again an overclocking review of some High-End DDR2 memory modules.
The new OCZ PC2-8500 2GB Reaper HPC edition DDR2 RAM looks extraordinarily good and offers high overclocking,
thanks to the excellent heatpipe cooling.
OCZ permits the users to operate the modules with up to 2.35 V without loosing the OCZ Lifetime Warranty
and this Vmem should be enough to achieve very good overclocking results.
If you like to know if the memory is also well overclockable with the default 1.80 Volt and what you're able to expect
with an voltage increasment higher than 2.30 Volt, you shouldn't miss this review.
All memory test results can be compared with all previously tested memory modules in the benchmark chart.



Thanks for the support ...

Many thanks for the support with the PC2-8500 2GB PC2 8500 CL5 Reaper HPC Edition kit OCZ2RPR10662GK by OCZ.

The 2 GB kit contains 2x 1024 MB 240-pin DIMM DDR2 1066 (PC2-8500) memory modules and
has currently a price of approx. 230 Euro (04/2007).
They're available e.g. at our sponsors.



The supply of the two 1024MB PC2-8500 memory modules ...

The two memory modules are delivered in this packing:



That is contained in the scope of delivery ...

OCZ supplies the two memory modules without an installation guide, but it should be also possible for less experienced users
to install them easily, because the installation should be explained in the motherboard manual.
Please read the mainboard manual carefully, especially the help for the Dual Channel support allocation.

Here is a picture of the two contained PC2-8500 memory modules:



The technical data ...

Manufacturer OCZ
Article number OCZ2RPR10662GK
Memory 2GB kit (1024MBx2)
Package 240-pin DIMM
Type DDR2 PC2-8500
Configuration 128Meg x 64
Error correction NON-ECC
Speed DDR2 1066 (533 MHz * 2)
Voltage 2.30 - 2.35 Volt
Memory timing 5-5-5-15 (Tcl-Trcd-Tras-Trp) - EPP



Characteristics and other features ...

The memory modules are provided on a green plate with black passive heatsinks (heatspreader) to get lower temperatures
with higher voltages and higher frequencies.
And this heatspreader is connected to another heatsink with the integrated heatpipe (HPC means Heat Pipe Conduit).
This offers additional cooling, which makes sense with these high memory voltages.
Of course this cooling device looks also very nice and is surely an inducement to buy them ;-)
Furthermore these modules comes with EPP (Enhanced Performance Profiles) to get reduced latencies and
high frequencies on latest generation motherboards with EPP support. Overclocking couldn't be easier!

Here's another picture of the nice OCZ PC2-8500 modules 2GB Reaper HPC Edition ...


And here's a picture of the OCZ specifications ...



Benchmark values and test results ...

Let us begin with the most important part of the test report, because the optics and packing is of course rather
secondary and the highest possible stable performance is the most important factor.
The test results are based on an ASRock AM2XLI eSATA2 SLI motherboard with an Athlon 64 Socket AM2 3000+
CPU on different frequencies depending on the reference clock for the different memory benchmarks.
Furthermore the memory modules were tested on another reference board (Foxconn C51XEM2AA) to test the
high frequency with higher voltages.
The multiplier adjustment remains on 9x 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 XP Professional SP2 is used as the operating system.
The stability was examined with the software Memtest86 and SiSoft Sandra Lite 2007.SP1 program is used for all
benchmarks, since it offers extensive adjustments and a fast result comparison.
BTW. the latest SiSoft Sandra 2007 version is now available on our download server and can be downloaded much faster
and very easily - ALL benchmarks are also included in the free Lite version.

But let us continue with the review ...
First the maximum possible frequency of the memory module was determined.
The memory frequency was increased in small steps with a fixed memory timing of 4-4-4-10 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 4-4-4-10 (Tcl Trcd Tras Trp) timings was stable with enormously high 453 MHz.

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.

Officially OCZ specify the voltage of 2.30 - 2.35 Volt without loosing the lifetime warranty and this is a
considerable voltage to get nice overclocking results.
The default DDR2 memory voltage is 1.8 Volt.
In the test the modules were stable with 2.20 V and timings of 5-5-5-15 up to 558 MHz (DDR2-1116).
And with voltages about more than 2.30 Volt it was possible to reach nearly 600 MHz (internal 1200 MHz).
This isn't possible on all motherboards, because on the one hand it's necessary that these high clock rates are supported
by the motherboard and on the other hand it's absolutely necessary to support the high memory voltage (Vmem).
For the test I've additionally used a slightly modified reference board (Foxconn C51XEM2AA) to get this result,
but even I felt a little bit queasy by using more than 2.30 Vmem ...

This highest possible frequency was compared with two settings.
On the one hand 453 MHz with SPD values (these are programmed in the SPD IC by the manufacturer),
and on the other hand 200 MHz (x2) with SPD values.

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


Here're the benchmark results:

RAM Range Int Buff'd iSSE2
Memory bus range
453 MHz
fix (4-4-4-10 2T)
6344 MB/s
14496 MB/s
453 MHz
SPD (5-5-5-15 2T)
6296 MB/s
14496 MB/s
200 MHz
SPD (4-3-3-8 2T)
4667 MB/s
6432 MB/s


Here's a diagram of the benchmark values:


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

With this bechnmarks, the company OCZ was able to reach the second place close behind the Crucial PC2-8000 modules,
which were a little bit more overclockable (up to 461 MHz) on the default voltage of 1.80 V.
Starting from a memory voltage of 2.30 V and more, the benchmark results looks of course somewhat differently,
because thanks to the new cooling technology, OCZ would reach the top of all results.
Sure, it's questionable to increase the voltage instead of lowering the fabrication process, but thanks to the
high manufacturer specifications, they'll take the risk.


Result and general impression ...

The OCZ 2GB PC2-8500 Reaper HPC Edition kit is even with the default DDR2 voltage of 1.80 V close to the top of all
previously tested memory modules.
Thanks to the new Heatpipe Cooling the RAM remains with an enormously high voltage of 2.35 V pleasantly cool and
can be overclocked hereby much higher than the manufacturer rated 1066 MHz.
These high-end DDR2 memory modules are thus particularly suitable for motherboards with a high Vmem,
or needs at least an experienced user, who's able to modify the Vmem of the motherboard.
If all conditions are created, this OCZ memory permits an enormously high PC overclocking and
recompense the costs with strong performance.



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


All pictures and article copyright 2007 www.ocinside.de