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Author Topic: Sapphie Vapor-X OC 1 Gb HD 5870 5.0 GT/s mod. Which resistor ?  (Read 411 times)
SMIKX
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« on: August 02, 2017, 02:40:13 PM »

Having done the 5.0 GT/s mod on a newly purchased HIS HD 7950 I'd like to do the same to my backup card ( Sapphire Vapor-X 5870 1 Gb OC ) .

Anyone know which resistor needs to be identified ?

I have scoured the net for info but obviously I haven't found the correct question to ask.

Thanks in advance.
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Mac Pro 4,1 upped to 5,1 Dual Quad Core 2.93ghz 17Gb 480Gb SSD TRIM enabled.
HIS HD 7950 3Gb 5.0 GT/s EFI on mDP to DVI + DVI to DVI.
10.9.5 - 10.12.6  - 10.6.8 - Win 7 not Bootcamp. 
AREA 2 port USB 3.1 & Inateck USB 3.0 4 port in OS X 10.9.5.
Rominator
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« Reply #1 on: August 10, 2017, 01:59:55 AM »

On 5870 it was up near CF bridge, IIRC

Only way to find for certain is to get PC and Apple 5870 and look.
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SMIKX
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« Reply #2 on: August 10, 2017, 04:44:12 AM »

On 5870 it was up near CF bridge, IIRC

Only way to find for certain is to get PC and Apple 5870 and look.

Thanks Rominator .. do you recall the name / designation of the actual resistor ?

Here in Japan used 5870's  ( PC only ) are selling for around ¥2,900 US$26. . but look at this price for for a used "Mac" 5870 . .
http://www.mac-paradise.com/htmls/1100000123866-11.html

. . no mention of genuine 5.0 GT/s link speed.

¥37,750 + 8 % sales tax = ¥40.770 = U.S.$ 370 !    These people have no shame. I won't be buying so I won't be able to compare PCBs.

The 5870 is still a good backup card . . along with the 5770 ( one 6 pin ).

I have a Sapphire Vapor-X O/C 1 gb 5870 and an HIS 5870 1Gb both flashed courtesy of Netkas & your humble self.

I enjoy your forum comments and retorts immensely . . you guys taught me how to fish. . . I've since taught a couple of others here . .a great philosophy that I wholeheartedly support and adhere to.
Logged

Mac Pro 4,1 upped to 5,1 Dual Quad Core 2.93ghz 17Gb 480Gb SSD TRIM enabled.
HIS HD 7950 3Gb 5.0 GT/s EFI on mDP to DVI + DVI to DVI.
10.9.5 - 10.12.6  - 10.6.8 - Win 7 not Bootcamp. 
AREA 2 port USB 3.1 & Inateck USB 3.0 4 port in OS X 10.9.5.
nekton1
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« Reply #3 on: August 13, 2017, 11:24:42 PM »

Thanks to the above hint from Rominator, SMIKX and myself were able to find the solder pads on the relatively ancient Sapphire Vapor-X HD5870 that control the PCIe Gen2 5 GT/s Link speed.
Looking at the back of this card with the Crossfire connector uppermost, you'll see a row of three vertical solder pads sitting in almost empty space below the left row of CF board edge connectors.  I soldered a chip resistor to bridge the two pads furthest from the CF connector and fired up the card (which is flashed with the Netkas rom—thanks Netkas). It shows the following (see screenshot).

SMIKX confirmed this with a 2B pencil using a graphite pencil line between the same two pads.  He has also confirmed the same pads on the HIS 5870.  (The photos of the two boards are from SMIKX.)

The solder job is relatively easy because there is plenty of space around the empty pads—just make sure to clean them first and use a very fine pair of chip tweezers to hold the chip resistor in place while tacking one side and then complete the solder.  Use a good electronics iron or soldering station too. Be sure there are no solder bridges.

It's a small improvement in speed for a little work.

Meanwhile, the search for a solution to why the RX460 does not boot in High Sierra continues.


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« Last Edit: August 14, 2017, 12:39:37 AM by nekton1 » Logged
SMIKX
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« Reply #4 on: August 14, 2017, 05:27:26 PM »

I put up a webpage with nice big photos here http://www.hatsuon.net/cMP_5.0_MOD.html

Enjoy !
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Mac Pro 4,1 upped to 5,1 Dual Quad Core 2.93ghz 17Gb 480Gb SSD TRIM enabled.
HIS HD 7950 3Gb 5.0 GT/s EFI on mDP to DVI + DVI to DVI.
10.9.5 - 10.12.6  - 10.6.8 - Win 7 not Bootcamp. 
AREA 2 port USB 3.1 & Inateck USB 3.0 4 port in OS X 10.9.5.
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