In recent days, when the RX 480 test went live, everyone was amazed by its performance. At the same time, the RX 480 was blown up by some recent news; the RX 480 burned board and unsafe arguments were buzzing.
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In JD.com, the RX 480 also suffered from a full range of products. At one time, most of the RX 480 were gone, and only a small amount of RX 480 still survived.
Most of the information for the initial work is from this map of tomshardware :
Because the main board current is 85w , the RX 480 has been questioned a lot.
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In response to this situation, tomshardware re-validated and gave some instructions. Let's take a look at their explanations.
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PCI-E power issues;
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We are concerned about the PCI-E tested to take power 86w, PCI-E than conventional 75w of the problem, tomshardware re an experiment and do some explanation for this situation.
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First of all, let's take a look at the specifications set out in the PCI SIG 's organizational specifications;
PCI-SIG specification, for the PCI-E slot power specification is a maximum of 12V circuit 5.5A recommendations, for 12V circuit, there can be about 8% deviation tolerance, calculate the deviation tolerance about PCI- E slot size is about 72w .
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Tom said that the 12v in the circuit will not be the standard 12V , and there will be fluctuations. They put out the charts for the second test;
Above is the ammeter and below is the voltmeter. Variation in the amplitude of the voltage of 12v ATX specification of the range of + -10%, the average value of them according to the current but the measure down, the average value reached 6.74A, compared to the recommended specifications from digital to 5.5A Something higher.
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The value of this existing norms beyond PCI-E 23%, although in absolute terms, only the value of multi-1A does not have much of a problem, but the "standard always some reason", carried out accordingly tomshardware Some explanations;
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They think that this over-limitation is not a big thing, and there are traces in the current norm.
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PCI-E in the original specification, there are four pins for the PCI-E 12V power for reservation. Two needles are at the top and two needles are at the bottom. They said that the old graphics card can see these power supply golden fingers (we speculate that it is 1 's location of the 2 interfaces, relative to the inside and outside)
The third gold finger next to it was reserved at the beginning, but no definition was made at the beginning. However, in the latest version now, which has been designated as the root Goldfinger additional 12v power supply Goldfinger, and was originally defined by a four-pin PCI-E power were up to 12v graphics card. However, this change does not apply to older hardware.
Here we also think of a news item that has been mentioned before. That is where the PCI-E 3.0 specification was released. It was reported that the power supply capacity of PCI-E 3.0 will be increased to 100w , but when the last specification is released, It was developed in 75w . However, if the current design of this undefined pin is implemented, then the increase in the power supply capability of PCI-E 3.0 does not seem to be a fantasy.
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As for the case of taking more than 75W from PCI-E 3.0 , there have been many phenomena in the test of graphics cards; for example , the maximum PCI-E power consumption that occurred during the GTX 980TI test ;
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Minimum
Maximum
Average
PCIe Total
34.16W
358.80W
184.05W
Motherboard 3.3V
1.19W
3.43W
2.26W
Motherboard 12V
20.16W
80.52W
47.17W
Motherboard Total
22.27W
83.03W
49.43W
Graphics Card Total
66.08W
428.38W
233.48W
It is also relatively common to take a maximum value of more than 75w , but this is the case where the maximum value occurs, not the average value.
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Based on some of the above conclusions, tomshardware made some of the following summary:
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The 12V voltage value is normal on AMD 's graphics card, and the current obtained by PCI-E is high. However, their testing has decreased after the test equipment has been adjusted compared to the first test.
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The existing hardware device can completely cope with this extra sudden situation (because this is also happening under full load), as long as your slot and gold finger are not corroded and completely clean. It is recommended that the graphics card be installed securely during installation to ensure that sufficient power is available.
In addition, according to our own speculation, many changes have occurred since the update to PCI-E 3.0 . Therefore, the old motherboard with relatively weak power supply, that is , the motherboard before PCI-E 2.0 may not be very well adapted to this article.
Recently, AMD announced that it will have a new version of the driver to solve this problem. According to the existing allocation situation, the percentage of the video card itself that it needs to take power from the PCI-E and the power from the external interface should be set to achieve a balance.
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