For our memory overclocking tests we are usually interested in two main elements: how well the memory scales with additional voltage and how versatile it is at overclocking with different timings. So far we have capped memory voltage at 1.40V during in our DDR4 overclocking endeavours, which is almost 20% over the stock 1.20V. However, since this is more of a mass market product than an enthusiast-class one, and it doesn't come with any heatspreaders, we decided to lower that limit a bit to 1.35V. Thanks to this static voltage, we were able to put all our efforts into determining timings scalability instead.
In order to make sure that there weren't any possible CPU-related bottlenecks, the CPU Cache Voltage was set to 1.30V and the CPU System Agent Voltage set to 1.25V. We focused on four basic timing configurations (12-12-12 / 13-13-13 / 14-14-14 / 15-15-15) all with a 1T command rate for optimal performance.
With the pleasantries out of the way, let's get to the fun stuff.
As you can see, considering the base DDR4-2133 clock speed this memory kit proved to have quite a bit of overclocking headroom. Now this is our first 32GB DDR4 memory kit, so we have nothing else truly comparable to compare it to, but this is a solid result. DDR4-2400 with tight 12-12-12 timings and over DDR4-2666 at standard 15-15-15 timings are two noteworthy plateaus that signify to us that this is much more than your average OEM memory kit. When you consider that most 32GB DDR4-2666 memory kits retail for well over $600, that should definitely puts this $420USD/$450CAD model's results in a sharp focus. We look forward to testing out Crucial's Ballistix Elite memory kits, which their enthusiast-oriented factory overclocked memory kits, with pre-binned ICs and really cool looking heatspreaders.
By the way, all these overclocks were achieved with an aggressive 1T command rate. As you will see at the very bottom of this page, if you do elect to go the 2T route this model does stretch its legs even more, but at the potential expense of overall system performance if you can't make up the deficit with enough extra memory clock speed.
These screenshots are just to prove that we did indeed achieve the overclocks listed, and that they were stable enough to pass a series of mainstream benchmarking and stress testing applications. If you are doing super critical work, then maybe a little Prime95 stress testing should be done as well, but for gaming and day-to-day tasks our testing is more than sufficient.
Since all of these overclocks were done with the 1T command rate, we decided to see what this Corsair kit was capable of at 2T, which is what this particular model is rated for anyways. As you will see below, it is very impressive.
By switching the command rate to 2T, and keeping the timings at an identical 15-15-15-35, we were able to go from DDR4-2680 to DDR4-2756. It's not a huge difference, but does it actually translate to improved system performance? Well check out the following two pages to see our benchmarking results with seven different timing configurations, including one with a high 4240Mhz Uncore to demonstrate how important is it for you to match high memory speeds with an appropriately overclocked Uncore frequency.
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