Page 1:AMD's A10-7800 Shoots For The Sweet Spot
Page 2:APU, Motherboard and Memory
Page 3:How We Tested AMD's A10-7800
Page 4:Results: CPU
Page 5:Results: OpenCL and HSA
Page 6:Results: Gaming
Page 7:Power Draw: Overview
Page 8:Power Draw: Efficiency
Page 9:Power Draw: Comparing the Logs
Page 10:AMD Turns Over a New Leaf with the Efficient A10-7800
How We Tested AMD's A10-7800
While we adapted our graphics card test setup for the APU tests, the equipment didn't change. The HAMEG HZO 3054 (Rohde & Schwarz) is the core instrument, a fast four-channel DSO that can be remote-controlled via Ethernet and store up to 60,000 samples per channel.
We run the 12 V wires of the eight-pin (2 x four-pin) CPU power cable through a current probe, as shown in the left picture below, and also the 24-pin cable's 12 V wires (on the right). That makes four HAMEG HZO50 probes to measure the current without having to insert a series resistor into any cable. Simultaneously, each rail’s voltage is fed into a HAMEG HMC8012, which also has the deep storage and remote control options installed.
In order to tame the massive amount of data, we use a custom program and Excel. A measurement takes a full minute, and the sampling interval is 10 ms, which results in 6000 samples. Shrinking the sampling interval further wouldn't yield a tangible benefit, and would instead drown us in test data.
Unsurprisingly, at less than 100 W power draw, platform-oriented benchmarking isn't as wild as some of the graphics card-based results we've seen, and the motherboard doesn’t impose massive load spikes on the PSU. But there are still a few noteworthy observations.
As a preview to the following pages, let’s look at the motherboard's power draw in one second:
Test Setup and Test Equipment:
|Method||Contact-free DC measurement at PCIe slot (using a riser card)|
Contact-free DC measurement at external auxiliary power supply cable
Mass-free Voltage measurement at external auxiliary power supply cable
|Equipment||1 x HAMEG HMO 3054, 500 MHz digital multi-channel oscilloscope|
4 x HAMEG HZO50 current probes
3 x HAMEG HZ355 (10:1 probes, 500 MHz)
1 x HAMEG HMC 8012 digital multimeter with real-time storage function
|Test System||MSI A88XM Socket FM2+|
AMD Radeon Memory
Corsair H100i Closed-Loop Water Cooler
Corsair Neutron 480 GB SSD
SeaSonic X-Series PSU