FX Memory Frequency Scaling and Testing Configurations
Finally, with AMD advertising the FX series of processors as having support for DDR3 memory speeds as high as 1866 MHz, I decided to see how much of an advantage you would get in terms of raw memory performance by simply turning that up. I used some Corsair DDR3-1866 Vengeance DIMMs for the testing.
In my quick Sandra testing I saw a 13% boost in memory bandwidth by simply bumping the settings from DDR3-1333 to DDR3-1600 and then another 6% going to DDR3-1866. I was also able to run the memory at DDR3-2133 settings and was able to cross the 20 GB/s mark!
Our CPU testing configuration remains mostly unchanged from our AMD Llano APU review this past June. For the new AMD FX processor testing our specs were as follows:
- AMD FX-8150 processor
- ASUS Crosshair V Formula 990FX motherboard
- Corsair H100 water cooler
- 2 x 2GB DDR-1866 Corsair Vengeance (running at DDR3-1333)
- Intel X25-M G2 160 GB SSD
- GeForce GTX 285 Graphics card
- PC Power and Cooling 1200 watt PSU
- Windows 7 SP1 64-bit
There are going to be a lot of numbers and graphs coming at at you on the following pages, but here are the keys to look for in my opinion:
- AMD FX-8150 versus Phenom II X6 – Many users will be wondering if they should get the new 8-core Bulldozer based part or save some cash and maybe upgrade to the 6-core Phenom II X6. What applications take advantage of the extra cores and frequency?
- AMD FX-8150 versus the Intel Core i7-2600k – Both of these CPUs support 8 threads, but which can handle the very heavily threaded workloads the best?
- AMD FX-8150 versus Intel Core i5-2500k – While the 2500k is the closest price competitor to the FX-8150, how does this four threaded CPU go up against eight thread competition?
- Power and Efficiency – Does the AMD FX draw a lot of power and warrant the inclusion of a new water cooler option?
On to the tests!