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::>Processors > 2014 > 08 > AMD A10-7800

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31-08-2014


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AMD A10-7800 processor: review and testing

"Finally, we have!" These words were said during the announcement of the three models from the family of hybrid processors AMD Kaveri: AMD A10-7800, AMD A8-7600 and AMD A6-7400K. After all, since long time we have only two options: AMD A10-7850K and AMD A10-7700K. This state of affairs was not particularly suited for some users, as mentioned above two models are the flagship of lineup, and accordingly are have not the lowest price tag. Therefore, when building a low cost PC the users had to buy the representatives of the previous generation APU AMD Richland, or the competitor options.

The situation must change with the release of AMD A10-7800, AMD A8-7600 and AMD A6-7400K, because among them there are cheaper and more energy-efficient solutions that will significantly expand the scope of the platform Socket FM2 +.

We have devoted several materials to characteristics of micro-processors AMD Kaveri («Презентация APU AMD Kaveri: революционный шаг в будущее или топтание на месте?», «Презентация десктопных процессоров линейки AMD Kaveri: AMD A10-7800, AMD A8-7600 и AMD A6-7400K выходят на рынок» and now we will focus on the practical part of the question. We will start from the most efficient model AMD A10-7800.

AMD A10-7800

The specs:

Model

AMD A10-7800 

Marking

AD7800YBI44JA

APU socket

Socket FM2+

Clock frequency, MHz

Nominal

3500

Turbo mode

3900

Multiplier

Nominal

35

Turbo mode

39

Basic frequency, MHz,

100

L1 cache-memory capacity, KB

2 х 96 (instruction memory)

4 х 16 (data memory

L2 cache-memory capacity, KB

2 х 2048

L3 cache-memory capacity, MB

No

Micro architecture

AMD Steamroller + AMD GCN

Code name

AMD Kaveri

Number of computational cores (CPU + GPU)

12 (4 + 8)

Instruction support

MMX(+), SSE, SSE2, SSE3, SSSE3, SSE4A, SSE4.1, SSE4.2, x86-64, AMD-V, AES, AVX, XOP, FMA3, FMA4

Supply voltage, V

-

Max design power (TDP), W

65

Critical temperature, °C

71,3

Technological process, nm

28

Technology supported

AMD 64-bit

AMD Turbo Core 3.0

AMD PowerNow!

AMD VT (Virtualization technology)

AMD EVP (Enhanced Virus Protection)

AMD Dual Graphics

AMD TrueAudio

AMD Mantle

AMD Eyefinity

AMD Fluid Motion Video

AMD Configurable TDP

On-board memory controller

Max memory capacity, GB

-

Memory type

DDR3 / DDR3L

Maximum frequency, MHz

2133

Number of memory channels

2

Max number of modules per one channel

2

On-board graphics core AMD Radeon R7 Graphics

Data flow processor

512

Rasterization modules

8

Texture blocks

32

GPU clock frequency, MHz

720

Instruction set

DirectX 11.2

OpenGL 4.3

DirectCompute 11

OpenCL 1.2

Shader Model 5.0

Packaging, set of delivery and design

AMD A10-7800

We obtained a pre-sale (test) sample of the processor without the packaging and cooling system, so the description of these components is missed. We note only that the specified TDP level of the model AMD A10-7800 is 65 W. Therefore, most likely, in complete version we see the standard cooler for 65 W AMD solutions from (for example, like AMD Athlon X4 740).

AMD A10-7800

Externally APU AMD A10-7800 is no different to the earlier reviewed members of the family AMD Kaveri: AMD A10-7850K and AMD A10-7700K. The heat-spreading lid has the name of the series and model marking. It the countries where the chip was produced (Germany), and country of the final assembly of the processor (China) are specified.

Arrangement of contacts on the back side corresponds to the CPU socket Socket FM2+. Let’s recall that family APU AMD Kaveri is not compatible with socket Socket FM2.

Performance analysis

AMD A10-7800

AMD A10-7800 is one of the top solutions in the lineup, so it includes 12 computational cores - maximum configuration for APU AMD Kaveri.

During normal operation, the speed of AMD A10-7800 equals to 3500 MHz at a reference frequency of 100 MHz and the multiplier "x35". At the time of reading the core voltage was 1.352 V. Thus, the hero of the review on the 200 MHz is slower than the top-end AMD A10-7850K, but also requires less voltage for its correct operation: 1.352 vs 1.392 V.

AMD A10-7800

If you enable the mode of dynamic frequency increase using proprietary Turbo Core 3.0 technology the multiplier is increased up to “39”. APU clock speed is increased to the level of 3900 MHz but the supply voltage was decreased to 1.128 V.

This, at first glance, the strange behavior of the processor has the part of the answer to the question: "How could the AMD reduce the TDP level from 95 to 65 W?"

The fact that AMD A10-7800 operates at speed of 3900 MHz with a very small load. Run process immediately leads to a drop in frequency, sometimes even below the level of 3500 MHz.

AMD A10-7800

In other words, the value of 3900 MHz remains only "on paper", but in reality, the speed of a novelty ranges from 3000 - 3500 MHz, which is clearly visible on the chart. Voltage supply varies from 1.288 V to 1.384 V.

AMD A10-7800

In this mode of operation APU AMD A10-7800 was warmed up to 41°C (using a bench cooler Scythe Mugen 3) which is a pretty good result.

AMD A10-7800

In idle mode the multiplier is decreased to value "x14", thus the frequency is lowered up to 1400 MHz. Voltage in this case is 0.864 V.

AMD A10-7800

Cache memory of AMD A10-7800 is distributed in the same manner as for AMD A10-7850K:

  • L1 cache memory: for each of the 4 cores there are 16 KB for data with 4 associativity channels and for each 2 cores there is a module with 96 KB for instructions with 3 associativity channels;
  • L2 cache memory: for each 2 cores there are 2 MB with 16 associativity channels;
  • L3 cache memory is absent.

AMD A10-7800

DDR3 RAM Controller runs in dual channel mode and supports modules with frequency up to 2133MHz.

AMD A10-7800

As at the structural level model AMD A10-7800 is an analogue to AMD A10-7850K, it is quite logical that the performances of their graphics cores are the same: 512 unified shader pipelines, 8 ROPs and 32 texture units. It is noteworthy that the frequency of iGPU AMD Radeon R7 Graphics (code name is still a mystery) was not changed and remains at level 720 MHz. That is a decrease of the thermal packet of processor AMD A10-7800 to the level of 65 W theoretically should not affect the performance of its graphical part.

Testing

 

Before we go directly to the analysis of the above graphs, we want to say a few words about the impact of technology AMD Turbo Core 3.0 on the speed of your computer. Its disabling leads to a drop in system performance by an average of 3%. In most cases, this difference is invisible, although for maximum performance it is better to leave this option activated.

We now proceed to compare new item with its competitors. Unfortunately, at the time of reviewing it did not appear on store shelves. However, the recommended price tag for the USA ($ 155) and Europe (€ 140), we can assume that its most competitors will be 2-core Intel Core i3 solutions of families Intel Haswell/Intel Haswell Refresh.

However, according to testing, the novelty is unlikely can compete with them, at least in terms of "pure" processor performance. After all, AMD A10-7800 lags an average of 12.5% even the younger model Intel Core i3-4130, which costs about $ 135.

If we take any processor commensurate according to the price, for example Intel Core i3-4330/4340, the difference will be even more significant. The same situation is when comparing AMD A10-7800 with AMD FX-6350 which is about $ 135 – 140. In this case, the performance difference is almost 24% in favor of the last. So we can conclude that it is no purpose to build gaming PC with a discrete graphics card on the basis of AMD A10-7800.

Therefore, in our opinion, the most realistic application of new item is mini-PC, HTPC and productive entry-level configuration with a small part of the requirements of 3D-graphics.

In terms of processor performance the new product is along with AMD A10-7700K. However, it surpasses (on average 17%), if we are talking about applications that use 3D-graphics. At the same time AMD A10-7800 is also "cold" (the difference in the TDP of 30 W), and accordingly more energy efficient.

As for the comparison with the hero of the review with AMD A10-7850K, the results are more than good. The advantage of the last is an average of only 3%. Where integrated graphics is enabled, both models were on the same level.  

But at this look on the difference in energy consumption. System with AMD A10-7800 consumed about 50 W less than the similar configuration based on AMD A10-7850K. Also do not forget that the flagship AMD Kaveri is $ 20 more expensive. Therefore, if energy efficiency is more important than good overclocking potential, you should stop the choice on the model AMD A10-7800.

Technology AMD Configurable TDP

AMD A10-7800

Previously we have already mentioned a technology «AMD Configurable TDP». In this review we decided to examine what it represents the practice and, most important, how useful it would be for the user? But first let's look at the theoretical side of the question.

Technology AMD Configurable TDP allows to change a TDP level of the processor depending on the type of tasks. To do this, you need to put the desired component in the motherboard BIOS, and the system will automatically optimizes its clock frequency and other parameters. In most cases this process involves decrease of device speed with the aim to minimize its power consumption and heating.

Of course, as part of a desktop PC this idea does not look very attractive, because nowadays you can easily buy productive cooler at an affordable price. And for today's power supplies extra 20-30 W is not something impossible.

But everything changes dramatically when we speak about nettops, HTPC and other types of compact computers. In this case, every watt counts. Therefore, the ability to change power consumption and heating only by one parameter will be welcomed. After all, not everyone has enough knowledge and patience to manually select values. That is, in certain situations technology AMD Configurable TDP can be quite useful and simplify the configuration of the system.

Now let's see how all of this is implemented in practice?

AMD A10-7800

Unfortunately this feature is currently available only from the BIOS menu. It is impossible to provide setting of TDP from the operating system. Besides, the technology AMD Configurable TDP is not supported by all motherboards. For example, the model ASRock Fatal1ty FM2A88X+ Killer has no corresponding menu item. Therefore, to test the capabilities of this function on the APU AMD A10-7800 we have used board ASUS CrossBlade Ranger. As you can see the change in the level of TDP is done by using the parameter «Target TDP». In this case, it is 45 - 65 W in increments of 1 W.

To find out the impact of technology AMD Configurable TDP CPU to CPU performance, first of all we conducted a standard set of tests at voltage 45 w at level TDP. And then did the same thing for the value of 65 W. In both cases, the technology AMD Turbo Core 3.0 was active. The results are given in the appropriate tables.

Processor part:


TDP 45W

TDP 65W

Difference

Futuremark PCMark 7

PCMark Score

3006

3254

8,25%

Computation Suite

6423

6939

8,03%

Futuremark 3DMark11

Score

6131

6439

5,02%

Physics

3620

4108

13,48%

Futuremark 3DMark Vantage

CPU Score

9177

10569

15,17%

SiSoft Sandra 2012

Arithmetical

Overall performance, GOPS

41,43

48,76

17,69%

Entire Dhrystone, GIPS

62,47

74,91

19,91%

Double Whetstone with floating-point, GIGAFLOPS

27,47

31,73

15,51%

Multimedia

Overal multimedia performance,  Mpixel/s

87,92

102,18

16,22%

Entire  multimedia, Mpixel/s

102,54

118,52

15,58%

Multimedia FP32/FP64 floating-point, Mpixel/s

55,23

64,59

16,95%

CINEBENCH R11.5

OpenGL, fps

55,44

63,44

14,43%

CPU, pts

2,9

3,37

16,21%

CPU (Single Core), pts

0,89

0,99

11,24%

WinRAR 4.20


3076

3348

8,84%

Fritz Chess Benchmark 4.2, knodes/s


6150

7177

16,70%

TrueCrypt 7.1a (Serpent-Twofish-AES, MB/s)

Encryption

119

137

15,13%

Decryption

125

142

13,60%

x264

1 pass, fps

30,18

34,55

14,48%

2 pass,fps

6,9

8,14

17,97%

Batman Arkham City

DirectX 11 (fps)

86

97

12,79%

Rezident Evil 5 Benchmark

DirectX 10, Smoothing x8 (fps)

79,4

88,9

11,96%

F1 2012

DirectX 11, fps

54

61

12,96%

R.U.S.E.

DirectX 9, fps

23

26

13,04%

Average value:

13,80% 

Graphics part:

 

TDP 45W

TDP 65W

Difference

Futuremark 3DMark11

Score

2242

2502

11,60%

Graphiks score

2088

2344

12,26%

Physics score

3653

4088

11,91%

Combined score

2189

2328

6,35%

Futuremark 3DMark Vantage

Score

7240

8694

20,08%

GPU score

6781

8199

20,91%

CPU Score

9085

10620

16,90%

SiSoft Sandra 2012

Arithmetical

 

Overall performance, GOPS

240,89

244,5

1,50%

Native dockable shader, Mp/s

840,68

864,63

2,85%

Emulate double shaders, Mp/s

69

69,14

0,20%

Cryptographic

Cryptography speed, Мb/s

6360

7000

10,06%

Rate of encryption/decryption

4840

5620

16,12%

Hashing rate, Мb/s

8350

8750

4,79%

Warhammer 40,000: Dawn of War II — Retribution

DirectX 10, fps

51,4

57,9

12,65%

Rezident Evil 5 Benchmark

DirectX 10, fps

63,7

65,3

2,51%

DiRT: Showdown

DirectX 11, fps

65,1

67,1

3,07%


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