Testing Method & Test Setup

To test the overclocking capabilities of the our kit, we are going to use an overclocked Intel Haswell platform due to its fast memory controller, which allows for all testing to be done within a reasonable period of time.

Motherboard	ASUS Maximus VI Impact (BIOS 0217)
CPU	Intel Core i7-4770K @ 4.5 GHz
Graphic card	ASUS GTX 580
Memory	Kingston HyperX Predator KHX28C12T2K2/8X
SSD	Samsung PM840 Pro
PSU	Seasonic Platinum 660 Watts
OS	Windows 7, 64 bit SP1

Even though Haswell is very flexible on the memory frequency one can set, very few people actually do base clock (BCLK) overclocking on their daily setups. Therefore, we fix the BCLK frequency at default 100MHz, only adjust the memory multipliers and then minimise the voltage for each given setting.
As usual, our stability method of choice is HCI Memtest. Since we are dealing with an 8 GB kit, we use eight 750 MB instances and call things stable if we see all of them to go past 150% without showing a single error.
Not to get things too complicated, we only set the primary timings, command rate (1T) and the memory voltage by hand while the rest of the settings are left for the motherboard and SPD to agree on.

Results

Traditionally, our aim is to see how memory reacts to voltage and timing adjustments and in case with Hynix MFR we have an almost linear dependence between stable frequency and voltage using a constant CAS latency. What comes to second and third entries in the primary timings list, tRCD and tRP, the main factor for lowest stable values for those is frequency, with voltage playing a role only in borderline areas. Lastly, the tRAS value we use in each part of the testing is a sensible value induced by an educated guess.
A good indicator of quality on Hynix is voltage required for stability at DDR3-2800 at CL11, which good sets can do below 1.70V and superb ones under 1.65V. In case with our HyperX, we have a lowest stable value of 1.73V, which isn’t exactly bad, but our expectations were set a tad higher given the status of this kit.
In other news, the memory can also reach DDR3-2200 with 9-11-11 or DDR3-2400 with 10-12-12 at reasonable voltages, but if this is the range of frequencies you are interested in, there are kits that will do these specs at a fraction of the price.
Another thing not in Predator’s favor is the voltage tightness of the second XMP, which was showing occasional errors already at 0.01V below the desired voltage value. A pass is still a pass, but in long-term, this might cause Kingston one or two additional RMA cases.

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Page 1 - Introduction

Page 2 - Closer Look

Page 3 - Photo Gallery

Page 4 - Results

Page 5 - Conclusion