Intel Core i5-2550K (Sandy Bridge), Overclocked to 4.2 GHz @ 1.3 V
Asus P8Z77-V LX, LGA 1155, Chipset: Intel Z77M
On-Board Gigabit LAN controller
AMD Gamer Series Memory, 2 x 4 GB, 1866 MT/s, CL 9-9-9-24-1T
I’ve been doing testing on Haswell to determine whether or not higher speed memory could improve system and specifically gaming performance, especially with multi-GPU systems. My intuition and some of the research I’ve read online suggests that Haswell’s “sweet spot” memory speed has actually jumped from the time-honored 1600MHz to 1866MHz. What I found with Battlefield 4 is remarkable, though. Testing on an i7-4770K overclocked to 4.4GHz and two overclocked GeForce GTX 780s in SLI, I discovered that memory speed affects Battlefield 4 performance in a very measurable and perceptible way. Check this out:
Where things get really exciting is in surround at a monstrous 5760x1200. Ordinarily this is a situation where the system will become totally GPU bound, yet Battlefield 4 again demonstrates a performance uptick going from DDR3-1600 to DDR3-2400. Average framerates are up 15.2%, and the all-important minimum framerate goes up 22.9%! Recognizing that these are rough figures culled from FRAPS runs in fairly empty maps, it’s still a large enough difference to be outside of the margin of error and more importantly, it’s a perceptible one. Playing the open beta in surround, I found that the faster 2400MHz on the memory made the game noticeably smoother and eliminated a substantial amount of stutter.
Kahless wrote:I'm definitely waiting for some more benchmarks.
I tried upping to 4.8ghz and I got a BSOD running prime95. I'm not sure what settings I should change to get that higher clock rate. I have a Corsair H80i liquid cooler. V core is set to 1.35ghz. Multiplier is 47 and FSB is 100. Should I up the Vcore to 1.4 or set the cpu capability from 100% to 110% before I up the vcore?
CPU Voltage - Vcore
The obvious this is the main voltage you need to make the adjustment when you increase the CPU frequency.
Remember, Sandy Bridge is 32nm chip so it doesn't need as much voltage as the 45 or 65nm chips. I would
suggest to keep this voltage below 1.40v is the max or keep the core load temperature under 70°C (more details
about thermal later on). Keep in mind, the higher Vcore the heat will be generated by the CPU. I wouldn't
recommend using over 1.35v for daily usage or unless you have good cooler.
According to Intel white sheet, the maximum voltage for Core Processor is 1.52v, however I wouldn't recommend you to run it for 24/7
Sandy Bridge is responsive to vCore adjustments and very little else...at least that we have seen yet. It does not seem to like super cooling either. However a modest vCore of 1.4v Core got us to 4.7GHz on the 2500K
CPU Current Capability can be set to 140% to increase the CPU VRM over-current trip threshold. This allows the CPU integrated voltage regulator to drain more current from the Extreme Engine DIGI+ III, allowing the processor to achieve higher operating frequencies and increased software loads at those frequencies.
A voltage regulator module (VRM) is an installable module that senses a computer's microprocessor voltage requirements and ensures that the correct voltage is maintained. If you are changing your computer's microprocessor (for example, changing from a Pentium to a Pentium Pro or a Pentium with MMX ), you need to add a voltage regulator module to the existing voltage regulator in the motherboard so that the new voltage requirements can be detected and accommodated.
In the case of the Pentium, the original Pentium has the same voltage requirement for its core or basic operation as for its I/O operation. Both use 2.8 volts. However, the Pentium Pro and the Pentium with MMX have different voltage requirements for core (2.8 volts) and I/O (3.3 volts). Adding a VRM allows it to regulate the voltage for I/O while the original regulator built into the motherboard continues to regulate core voltage.
A voltage regulator module or VRM, sometimes called PPM (processor power module), is a buck converter that provides a microprocessor the appropriate supply voltage, converting +5 V or +12 V to a much lower voltage required by the CPU, allowing processors with different supply voltage to be mounted on the same motherboard. Some are soldered to the motherboard while others are installed in an open slot. Some processors, such as Intel's Haswell, feature voltage regulation components on the same package as the CPU, instead of the motherboard. Most modern CPUs require less than 1.5 V. CPU designers tend to design to smaller CPU core voltages; lower voltages help reduce CPU power dissipation, often referred to as thermal design power (TDP).
Some voltage regulators provide a fixed supply voltage to the processor, but most of them sense the required supply voltage from the processor, essentially acting as a continuously-variable adjustable regulator. In particular, VRMs that are soldered to the motherboard are supposed to do the sensing, according to the Intel specification.
Modern graphics processing units (GPU) also use a VRM due to higher power and current requirements.
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