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Author Topic: Reference R9 270X R17 resistor hunt  (Read 1078 times)
SMIKX
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« on: July 26, 2017, 08:18:06 AM »

I bought an R9 270X which is sold by a Japanese company ( I live in Japan )
https://forums.macrumors.com/threads/how-to-make-link-speed-2-5gt-s-to-5-0gt-s-on-ati-card-and-nvidia-card.1547340/

I successfully flashed it for boot screens on lower DVI to DVI  and also  DP adaptor to HDMI.

The card runs well but at 2.5 GT/s PCI 1.0

Now I want to bump it up to 5GT/s PCI 2.0

On the back of the card I found a printed reference to the R17 resistor printed in white ink but not being PCB savvy
despite a 2 hour probe with a huge magnifying glass ( both sides & cooler + fans removed I cannot find R17 resistor.

What is the significance of the white printing on the card ?

Anyone have any ideas?

Thanks in advance.


* R17 resistor hunt cropped 02.jpg (194.72 KB, 520x721 - viewed 109 times.)

* r9-270x-e2gb_oc.jpg (101.19 KB, 800x474 - viewed 117 times.)

* R17 resistor hunt cropped.jpg (188.52 KB, 729x635 - viewed 109 times.)
« Last Edit: July 26, 2017, 08:21:45 AM by SMIKX » 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.
h9826790
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« Reply #1 on: July 27, 2017, 03:35:31 PM »

I personally suggest you forget about it.

1) we can do it on 7950 or 280X because there is a "reference", the Sapphire HD7950 Mac Edition card. However, for 270X, there is no reference. Even though here is a R17, doesn't mean that remove it can go PCIe 2.0.

2) The performance gain is effectively zero on my R9 280 (unless you install the card in a X4 slot, than the performance penalty may be up to 5% in benchmarks).

So, if you install the card in slot 1. There is absolutely no point to remove the resistor (even you can find it). If you install the card in slot 3 or 4, the protential risk still much much higher than the protential return. Not worth to do so.

If you want to do it for fun. Congratulations, AFAIK, you are the pioneer in this area, please let us know your result.
« Last Edit: July 27, 2017, 03:37:17 PM by h9826790 » Logged
SMIKX
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« Reply #2 on: July 28, 2017, 01:22:16 AM »

h9826790

Thanks for your reply ( it's been quiet around here lately ).

I use X-Plane 10 a lot - I made & maintain the scenery for Sydney's "Kingsford-Smith " airport. A few people in the x-plane.org forums have mentioned that their FPS framerates went up dramatically after doing the 5GT/s mod which I put down to the way X-Plane handles CPU/GPU.

Ive seen your posts regarding the PCI 2.0 mod and for everyday GPU use & largely I agree with you.
getting EFI Bootscreens initself is a nice thrill but I'm curious to discover whether there are occasions in which the PCI 2.0 mod actually pays off.

A question for you - you seem knowledgeable on the R17 subject . . .

Why is "R17" printed ( along with other resistors & caps ) in white on my R9 270 X PCB . .though for the life of me .. I can not find the actual resistor - checked both sides of the PCB with the fan & heat disisipator removed ?



* X-plane Sydney screenshot.jpg (232.69 KB, 1280x720 - viewed 89 times.)
« Last Edit: July 28, 2017, 01:26:48 AM by SMIKX » 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.
Rominator
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« Reply #3 on: August 10, 2017, 01:57:04 AM »

When they print a diagram like that it usually corresppnds to a nearby area where the stuff is too close together to label in situ.

So, a group of stuff with no labels.

"R" are usually black, "C" are frequently beige

That said, it is quite likely that R17 has nothing to do with this.

I found it on 7770 and 7870 and R9 290X, I don't think a one of them was labeled R17.

Only disconnect one side so you can easily put it back in case you brick the card.

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SMIKX
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« Reply #4 on: August 10, 2017, 04:52:35 AM »

Thanks . . . .noted. 

My  http://www.kuroutoshikou.com/product/graphics_bord/amd/rd-r9-270x-e2gb_oc/ "made in Japan knockoff R9 270X was actually in 'as new' condition, cheap ( ¥6,900 ) performs quite well in X-Plane 10, is silent and in Japan's intolerably hot & humid summer, a viable cooler alternative to my subsequently purchaesd ( EFI'ed % R17'd ) HIS HD 7050.
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.
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