How to increase R7 250X 2Gb Mining: Overclock | Claymore Miner | Hashrate

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Innosilicon A11 Pro ETH Review

How to ‘increase/ Max/ Optimize/ Tuning/ Boost‘ R7 250X 2Gb Mining: Overclocking/ Claymore Miner/ Windows 8/ Hashrate/ Best MSI Afterburner Settings/ PhoenixMiner 5.5C – The AMD R7 250X video card, also known as the Radeon HD 7770/8760, is still in service with some computers, although it has already served a decent period.

This is a video adapter that supports multi-threaded computing with very low power compared to modern video accelerators, so it’s interesting what it can do in modern conditions.

How to increase R7 250X 2Gb Mining: Technical detials

Features of the AMD Radeon R7 250X graphics card that affect multi-threaded performance

The AMD Radeon R7 250X (HD 7770) is a more powerful graphics card than the AMD Radeon HD 7750, which was discussed in the article “Mining on budget graphics cards: AMD Radeon HD 7750 1 GB” and was found to be limitedly suitable for mining only with cheap electricity.

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The AMD Radeon HD 7770/8760 has significantly higher capabilities than the 7750 model and can even compete with GPUs such as the Nvidia GT1030 in some ways.

The AMD Radeon R7 250X is powered by a 28nm Cape Verde chip with 512 stream processors in early 2014. The modification video card, with 2 gigabytes of GDDR5 video memory, has a bandwidth of 72 GB / s, which is 30% more than that of the Nvidia GT1030 with the same amount of memory.

The R7 250X’s 64-bit floating point performance is 76 GFLOPS, 50% faster than the GT1030. Despite this, the mining performance of the R7 250X is not as rosy as it should be, due to the outdated graphics card architecture and the low frequency of the GPU and VRAM.

The GPU-Z program detects the video card as AMD Radeon R7 250X (in this case, the ASUS model):

The computing capabilities of the AMD R7 250X graphics card are limited by OpenCL technology version 1.2:

The clinfo program in xubuntu 18.04 detects the AMD R7 250X graphics card as a Device with an AMD Radeon HD 7700 Series topology.

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Teams

lspci | grep -E "VGA|3D"

as well as

sudo lspci -v -s 01:00.0

executed in Linux give information that this is a Radeon HD 7770/8760 / R7 250X video adapter based on the Cape Verde XT core.

Memory chips cannot be viewed by the amdmeminfo utility in xubuntu 18.04 due to a segmentation error.

The amdcovc program detects only the temperature and fan speed (the situation is similar with other video cards with the Cape Verde core).

How to Optimize: ASUS R7 250X 2GD5 single-fan graphics card

The video card with one fan ASUS R7 250X 2GD5 is completely identical to the one-gigabyte version, except for the installation of more capacious memory chips. It is interesting to note the presence of an additional power connector in the model with a TDP of 80 watts.

PCB front with AMD R7 250X/Radeon HD7770 graphics card details (three GPU power phases and one VRAM power phase are placed on the left):

The front of the AMD R7 250X PCB from ASUS:

Radeon R7 250X video processor marked 215-082511:

The ASUS R7 250X 2GD5 power system is assembled according to the reference scheme (3 GPU phases + 1 VRAM phase + 1 PLL phase):

MOSFET transistors of the Texas Instrument 87350D power supply system (Imax = 40A), below you can see the power NexFET assembly AZ7805D in the QFN-8 package (contains two drivers for controlling two field-effect transistors):

Typical wiring diagram 87350D:

The power phase drivers are assembled on RT9611A MOSFET assemblies from Richtek in a QFN8 package marked 02-EF (each contains two field effect transistors):

Typical wiring diagram of the RT9611A assembly:

PWM controller ASP1213AH three-phase GPU power supply manufactured by Hybrid Digi + and Anpec APW7165A PWM power-phase PLL:

The memory power phase is controlled by an Anpec APW7165A PWM controller located near the 6-pin auxiliary power connector:

On the back side of the board in the center is the SOP-8 flash memory chip 25LD010:

AMD R7 250X video memory stacked with four Elpida W4032BABG memory modules

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Step-down DC-DC converter RT9018B on the back of the board:

RT9018B Wiring Diagram:

Texas Instruments 74HB125 (U700) (four-channel buffer with independent 3-state line drivers):

The ASUS video card heatsink is made of aluminum, which should be enough for a device with a TDP of 80 watts:

It is blown by a 9-bladed fan with a diameter of 75 mm with a 4-pin connector Firstd FD8015U12S (12V, 0.5A), mounting holes measuring 43x43x43 mm:

How to Maximize: AMD R7 250X cards affecting compute performance

The AMD R7 250X graphics card has the following specifications (compared to Nvidia GT1030, AMD RX550, R7 450 graphics cards):

Parameter Video card name
AMD Radeon
R7 250X
Radeon R7 450 Radeon RX550 GTX1030
Production start date February 13, 2014 June 30, 2016 April 2017/
October 2017
May 17, 2017
GPU Cape Verde XT Cape Verde PRX Lexa PRO /
Baffin LE
GP108-300-A1
Architecture GCN 1.0 GCN 1.0 GCN 4.0 Pascal
Technical process, nm 28 28 14 14
Number of transistors, billion 1.5 1.5 2.2/3 1.8
Crystal area, mm² 123 123 103/123 74
Number of Cores
(Cores)
640 512 512/640 384
Number of texture units/
rasterization
(TMU/ROP)
40/16 32/16 32/16 and 40/16 24/16
GPU operating frequency, MHz 950 925/1125 1100/1019 1228
FP64 floating point performance,
GFLOPS
76 59.2 75.71/85.68 35.23
Video memory size, GB 2 4 2/4 2
Video memory type GDDR5 GDDR5 GDDR5 GDDR5
Memory clock frequency, MHz 1125 1125 1750/1500 1502
Memory capacity, bit 128 128 128 64
Effective memory frequency, Gbps 4.5 4.5 7/6 6
Memory bandwidth, GB/s 72 72 112/96 48.06
Supported version of CUDA or OPENCL OpenCL 1.2 OpenCL 1.2 OpenCL 2.1 Miracles 6.1
Theoretical hashrate on Ethash, mh/s 9 9 14/12 6
Consumption
(TDP), watt
80 65 50/60 30
How to Maximize: AMD R7 250X cards affecting compute performance

How to Tune: AMD R7 250X Mining Hashrate

Tested on Windows 8.1 using unofficial RobinHood drivers, xubuntu 18.04 using amdgpu-pro drivers version 20.20-1089974, xubuntu 16.04 using amdgpu-pro-17.40 version 514569 (xubuntu 18.04 using version 20.20-1089974), slave graphics card with disabled monitor.

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On the vertash algorithm, the AMD R7 250X video card produces 78 kh/s (stock settings, Windows 8.1, RobinHood drivers):

On the Ethash algorithm in Windows 8.1, the Radeon R7 250X produces 3.5-4.5 mh/s when mining DBIX in PhoenixMiner 5.5c:

Claymore Miner 15.0 shows similar results in the ethash run on Windows.

Xmrig 6.8.2 on the CN_Haven algorithm on the Radeon R7 250X produces up to 130 h/s in Windows (while throwing in the wrong solutions):

Generalized information on the hashrate of the AMD Radeon R7 250X video card on different PoW mining algorithms:

  • Ethash (for DAG up to 2 GB) – 3.5-4.5 mh/s (PhoenixMiner 5.5C, Claymore Miner 15.0), DBIX mining, 1236 MB VRAM used, epoch 43, DAG 1.34 GB (Windows 8.1);
  • Ethash (DAG up to 2 GB) – 7-7.5 mh / s in xubuntu 16.04, PhoenixMiner miner is not stable;
  • Verthash – 75-80 kh/s, 1375 MB VRAM used (VerthashMiner 0.7.0, Windows 8.1) – quite good even compared to Nvidia GT1030, which runs at speeds of about 90 kh/s;
  • Cryptonight_Haven — 110-130 h/s, занято 1039 MB VRAM (xmrig 6.8.2, Windows 8.1, xubuntu 18.04);
  • Cryptonight_UPX2 — 4.5-5 kh/s (xmrig 5.11.4, xubuntu 16.04);
  • Cryptonight_GPU — 80-85 h/s, xmrig 5.11.2 в xubuntu 18.04;
  • Equihash 144.5 – – 6.5 sol/s, 1756 MB VRAM used (lolminer 1.21, Windows 8.1);
  • Argon2D-dyn – 14-16 kh/s, 1445 MB VRAM (sgminer-dyn1.0, Windows 8.1), on two threads (while the computer freezes periodically);
  • Sgminer-fancyIX 0.7.3, wildrig, teamredminer, gminer – do not work on the Radeon R7 250X video card.
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Conclusion

AMD Radeon R7 250X has higher performance than the Radeon HD 7750 with 1 GB of memory, which allows this video card to be successfully used for mining on Cryptonight algorithms, as well as on verthash. On the Ethash algorithm for coins like DBIX, the performance of this video card is very low even in Linux.

From a practical point of view, the return of AMD Radeon R7 250X video cards is very small, but still not zero, especially at moderate electricity prices.

Unfortunately, the full potential of the Cape Verde XT GPU is not revealed due to the small amount of memory.

The Radeon R7 450 graphics card, which has 128 fewer stream processors, demonstrates significantly “greater agility” on one of the most profitable algorithms for these cards – Cryptonight_Haven (240 h/s compared to 110-120 h/s for the R7 250X), which is due with 4 GB of memory.

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