AMD Llano A8-3850 APU Overclocking Test


There feature fewer overclocking options in most of the motherboard BIOS with the several A75 motherboards in the market,and relative overclocking setting in system is invalid.However,it also comes with Gigabyte A75M-UD2H mobo,which is claimed to be the first A75 motherboard to support APU overclocking.Now let’s conduct the overclocking test towards A8-3850 APU by means of A75M-UD2H,verifying the APU’s real overclocking potential.

Gigabyte A75M-UD2H Motherboard Previewed

A75M-UD2H not only features Ultra Durable 3 design,but also brings Super 4 philosophy.

The mobo employs blue PCB and Micro-ATX design,provides four DDR3 dual-channel memory slots supporting memory spec of up to 1866MHz.In addition,it offers the support for memory capacity of 32GB,provides two PCIe X16 slots,a PCIe X1 slot and a PCI slot.

The motherboard boasts 4+1 phase power circuit design,4 phase for CPU core,while 1 phase for GPU.

What’s more,the mobo features two PCIe X16 slots,one operates at x16,while another at x4,establishing the x16+x4 pattern upon CrossFire.When matched with A series APU,it can support Dual Graphics technology plugging in Radeon graphics cards,making the availability of dual-card connection between discrete and integrated graphics.

As for I/O,the mobo employs a PS/2 port,four USB 2.0 ports,two USB 3.0 ports,a eSATA connector,etc.In terms of output connectors,there include DVI-D,D-Sub,HDMI and DisplayPort.And DVI-D can support 2560×1600 output in Dual Link DVI pattern.

Benchmark Platform & Settings

CPU: AMD A8-3850 2.9GHz
Motherboard: Gigabyte A75M-UD2H
Cooler: AMD Phenom II X6 BE series original cooler
Graphics: AMD Radeon HD 6450
Memory: G.Skill Sniper F3-12800CL7D-8GBSR DDR3-1600 4GB(single)
System: Microsoft Windows 7 Ultimate SP1
Driver: AMD Catalyst 11.6 WHQL

APU FSB Improving To 140+MHz

Run Super PI in default frequency

Run Super PI after main frequency improving to 3692.0MHz

As we all know,Intel Sandy Bridge processors feature limit in overclocking,it would be difficult for locked multiplier SNB processor to surpass 110MHz.Currently the default AMD APU external frequency is100MHz as well(locked multiplier),so we reach the aim of improving main frequency only by means of adding FSB.

As to A8-3850 APU,the CPU core voltage improved from default 1.413V to 1.584V,its FSB could reach 142MHz.The x29 multiplier setting couldn’t enable,while it could enter system after decreasing to x26,at which time the main frequency boosted from 2.9GHz to 3.7GHz.

In this frequency,we could only conduct some light loaded test software,for instance,it took 20.748s with Super PI 1M,dropping from 25.85s.

Overclocked To 3.43GHz In Light Loaded Condition

In default frequency condition

Overclocked to 3.43GHz

We decreased the frequency from 3.7GHz to 3.43GHz(26*132MHz),and it could be able to pass some light loaded test software,such as Fritz Chess Benchmark,which would make the quad-core and quad-thread operate in full loaded condition.

In the default frequency of 2.9GHz,the "Relative speed" and "Kilo nodes per second" in Fritz Chess Benchmark scored 14.66 and 7034.While there improved to 15.84 and 7603,separately in the frequency of 3.43GHz.

We used Gigabyte EasyTune 6 to conduct slight adjustment towards APU’s FSB,in the main frequency of 3.4GHz,it can passed two ORthons test,in which time system stability was quite secured.

At this time,in 3DMark 11 test it scores E2058,while Radeon HD 6550D scored E1692 in default frequency.

The Breakthrough Of APU

Memory test in default frequency condition

Memory overclocking test

A75 motherboard provides multi memory multiplier settings,including x5.33,x6.6,x8 and x9.33.5.In default FSB of 100MHz,it can support up to memory frequency of 1866MHz,and the FSB adjustment range was large,too.And therefore,the memory overclocking capability of A75 can’t be neglected.

In our test,we used GSkill Sniper series memory,the default frequency of single 4GB DDR3 was 1600MHz,in ASUS Z68 motherboard,the frequency could reach 2200MHz.

In BIOS,the memory multiplier was set as x9.33,and we gradually improved APU FSB to reach the aim to boost memory frequcncy.After some debugging,the frequency could stabilize at 2296MHz in the memory voltage of 1.65V,and it entered system for concluding the test.



Through the overclocking test towards A8-3850 APU,we see its overclocking potential.There is still much improvement space for APU’s FSB,the frequency improves from 100MHz to 140MHz,and it’s believed that the APU could stabilize at the main frequency of 3.5GHz-3.6GHz.

In the past in the memory overclocking test with AMD platform,due to imperfect IMC of CPU,it would be difficult for memory frequency to surpass 2000MHz.This time there features progress with the memory controller of AMD Llano APU,the memory frequency could even reach 2296MHz in our overclocking test.

Of course,the excellent overclocking performance is also thanks to the Gigabyte A75M-UD2H motherboard,which is the first A75 mobo to support APU overclocking.

In addition,we conducted several debugging with GPU overclocking,finally we found out that thought it could enter system easily in core frequency of 800MHz(default frequency of 600MHz),it didn’t feature performance improvement when running gaming and test software,maybe it was caused by the unsolved bug in BIOS.

However,this time AMD Llano APU brings surprise in overclocking,especially in the memory overclocking,it’s really a breakthrough.We believe that in the future motherboard manufacturers will conduct optimization towards BIOS of A75 motherboards,maybe they will bring more surprise for overclocking players of AMD platform.

18 Responses to “AMD Llano A8-3850 APU Overclocking Test”

  1. Poindexter Says:

    You guys should test everything again, this time using a dual channel memory configuration. Llano needs a lot of bandwith, there’s no sense in using it in single channel. Maybe then the overclocked GPU will show some improvement…

  2. christian louboutin Says:

    In addition,we conducted several debugging with GPU overclocking,finally we found out that thought it could enter system easily in core frequency of 800MHz(default frequency of 600MHz)

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