How-to: Pencil mod your HD 3870!

KBD · Nov 29, 2008

technicks said:
I'm gonna look for a cheaper one this week i think.
Btw anyone know if the Thermalright V2 is a good GPU cooler for my HD3870?

it looks like a nice cooler, i think anything with the word Thermalright in it is good quality. I'm about to use a HR 03 GT on my 4870. Just read some reviews for it, you can start here:

http://www.tweaknews.net/reviews/thermalright_v2_vga_cooler/

thoughtdisorder · Dec 1, 2008

Zyge said:
I have Club 3D HD3850 512mb(pci-e). Do this mode work with my card? My card back is different, but it haves R1222 too.

I'm posting these pics for Zyge. Take a look fellas and see what you think.......Thanks!

DanishDevil · Dec 1, 2008

I don't know this stuff really well, but if it's possible to pencil, it's going to be around the large, square, black chip in this area of the back of the card. We will probably need a slightly clearer picture of the area.

SkY-ScRaPeR · Dec 7, 2008

CBOT said:
Here the New Version of PowerColor HD3870 512MB GDDR3 FP Edition.

No R1222.

Hi ...
Thank God :respect:

... Finally I've found helpful people like you guys

Me the same Like "CBOT" having DDR3 powercolor 3870

& as u can see in the quote Picture .. We both cant find the resistor R1222 despite it is written on the board ..
I have the GPU O/Ced to 823 Mhz only & need to increase it another 50 Mhz @least ...

Please I want someone Find for me the Specific RESISTOR cause I couldnt find it myself ...

Thanx in advance .

Random Murderer · Dec 7, 2008

SkY-ScRaPeR said:
Hi ...
Thank God ... Finally I've found helpful people like you guys

Me the same Like "CBOT" having DDR3 powercolor 3870

& as u can see in the quote Picture .. We both cant find the resistor R1222 despite it is written on the board ..
I have the GPU O/Ced to 823 Mhz only & need to increase it another 50 Mhz @least ...

Please I want someone Find for me the Specific RESISTOR cause I couldnt find it myself ...

Thanx in advance .

i need a clearer pic of that area.

SkY-ScRaPeR · Dec 7, 2008

Sorry "Random Murderer" .. This is what i could afford for you right now ..

it's a bit tricky as the pcb design is different from the conventional one as the R1222 is written where no target resistor is detectable

I know I am asking a heavy work from you to tell me which resistor shall I shade .. And I appreciate any help from you my sir From the posted picture .

Oh, I forgot to mention that I have a multimeter in case you ask me to measure each resistor individually,

SkY-ScRaPeR · Dec 9, 2008

Here I post a photo of it, I will be grateful if anyone could find me The R1222 Or any possible Resistor to increase the core Volt ,,

thoughtdisorder · Dec 9, 2008

^@ Sky- I'll shag RM's Azz outta bed in a bit and have him check in in case no one else responds......

Random Murderer · Dec 9, 2008

SkY-ScRaPeR said:
Here I post a photo of it, I will be grateful if anyone could find me The R1222 Or any possible Resistor to increase the core Volt ,,

can you give me the numbers off of the square chip to the left of the green mark?

SkY-ScRaPeR · Dec 10, 2008

Here is a more detailed picture of the card,, I hope you can help me increase the voltage ..

Random Murderer · Dec 10, 2008

i'm busy for the next few hours, but i'll give it a look when i'm free.

Charper2013 · Dec 13, 2008

Great guide! Ill be testing it soon enough!

Random Murderer · Dec 14, 2008

SkY-ScRaPeR said:
Here is a more detailed picture of the card,, I hope you can help me increase the voltage ..

[big pic]

ok, it seems the pinout on that chip is the same as the one i use, so if you have a continuity tester(most dmm's have one built in) you can probe around and find a resistor to test out.
pin 13 is your feedback pin. note that in the pic i completely covered the pin in a blue blob.

keep in mind that all you want to do is reduce the resistance to ground from this pin, so if you trust your soldering skills, solder a 100k trimpot from that pin to ground. simple, right? :roll:

Zyge · Dec 19, 2008

I was wondering where i can measure my card's core voltage? and is R1222 that place where I put lead to increase vcore? Card is Club 3d 3850 512mb pci-e

Random Murderer · Dec 20, 2008

Zyge said:
I was wondering where i can measure my card's core voltage? and is R1222 that place where I put lead to increase vcore? Card is Club 3d 3850 512mb pci-e

unless you can verify your card is on the reference board, i'll need some pics before i can say.

thoughtdisorder · Dec 20, 2008

^Pics of Zyges board:

@RM - I have more pics of this board on my laptop if you need to see them. Zyge sent them to me via email. :toast:

Random Murderer · Dec 23, 2008

Zyge: unfortunately, i can't see the writing on the chip i'm interested in. if i circled it on your pictures, could you either take a clear pic of it or type what's written on it for me?

Random Murderer · Dec 25, 2008

I got a 4870 for Christmas. expect a 4870 thread soon.

Nelson2011 · Dec 26, 2008

I got my 4870 2 weeks ago and it crapped out yesterday and im sending it back today. I got 845/1100 stable with my quad a 3ghz i got 15900 3dmarks

technicks · Dec 26, 2008

This is not the place for your card. This is for the HD3870 so kinda pointless to show off your 3Dmark score here.

Nelson2011 · Dec 26, 2008

Yeah but he said he was going to make a 4870 thread but im using my 3850 since my 4870 crapped out. :rolleyes:

thoughtdisorder · Jan 5, 2009

Random Murderer said:
Zyge: unfortunately, i can't see the writing on the chip i'm interested in. if i circled it on your pictures, could you either take a clear pic of it or type what's written on it for me?

Here's a clearer pic. Zyge sent it to me on Sunday but I just got to it.

http://forums.techpowerup.com/attachment.php?attachmentid=21570&stc=1&d=1231180126

Random Murderer · Jan 5, 2009

*sigh*

if you can get me the numbers off of the circled chip, i can help you. if not, then i can't help you.

Hitman · Jan 5, 2009

Flash

Hello
So many pages to read thru
I just got and installed a ATI HD 3870 and would like to get more out of it.
I have tried all the overclocking programs but this card no matter what will not let me.
Do any adjustments at all.
Is it the card and I need to do this volt mod to get it to overclock.

I also see you have the bios flash in your first post does this need to be done in addition to the volt mod or can I use the bios flash and get those clocks with out the volt mod?

You probably got ash this question a dozen times but with 15 pages to read threw I did not find the answer.

? What are decent temps with this card stock cooler.
With my Easytuner app from Gigabyte I can get OC to
Core 840
Mem 1191
But it wont let me do anything more
My temps are
GPU 77.01 C - 170.6 F
I have Riva tuner controlling the fan and 70%
These are None gaming temps I will get the gaming temps in a bit.

Hitman

Random Murderer · Jan 5, 2009

Hitman said:
Hello
So many pages to read thru
I just got and installed a ATI HD 3870 and would like to get more out of it.
I have tried all the overclocking programs but this card no matter what will not let me.
Do any adjustments at all.
Is it the card and I need to do this volt mod to get it to overclock.

I also see you have the bios flash in your first post does this need to be done in addition to the volt mod or can I use the bios flash and get those clocks with out the volt mod?

You probably got ash this question a dozen times but with 15 pages to read threw I did not find the answer.

? What are decent temps with this card stock cooler.
With my Easytuner app from Gigabyte I can get OC to
Core 840
Mem 1191
But it wont let me do anything more
My temps are
GPU 77.01 C - 170.6 F
I have Riva tuner controlling the fan and 70%
These are None gaming temps I will get the gaming temps in a bit.

Hitman

can you verify that you have a reference pcb? the only gigabyte 3870's i've seen are on non-ref pcb's...

the fact that you can only hit 840 core could be one of a few things. it could be that you don't have enough voltage, but i would try other things before a volt mod. first off, put your fan at 100% for now. i know it's loud, but we need to rule out temperature issues. second, i would back down the memory clock to stock for now to see how far you can push the core.
also, i would recommend atitool .27b3. it controls fanspeeds as well as clocks and timings, and it can dump your bios for you, should we need it.

Processor	Intel e8600 @ 4.9 Ghz
Motherboard	DFI Lanparty DK X48-T2RSB Plus
Cooling	Water
Memory	2GB (2 x 1GB) of Buffalo Firestix DDR2-1066
Video Card(s)	MSI Radeon HD 4870 1GB OC (820/950) & tweaking
Storage	2x 74GB Velociraptors in RAID 0; 320 GB Barracuda 7200.10
Display(s)	22" Mitsubishi Diamond Pro 2070SB
Case	Silverstone TJ09-BW
Audio Device(s)	Creative X-Fi Titanium Fatal1ty Profesional
Power Supply	Ultra X3 800W
Software	Windows XP Pro w/ SP3

System Name	Big Devil
Processor	Intel Core i5-2500K
Motherboard	ECS P67H2-A2
Cooling	XSPC Rasa \| Black Ice GT Stealth 240 \| XSPC X2O 750 \| 2x ACF12PWM \| PrimoChill White 7/16"
Memory	2x4GB Corsair Vengeance LP Arctic White 1600MHz CL9
Video Card(s)	EVGA GTX 780 ACX SC
Storage	Intel 520 Series 180GB + WD 1TB Blue
Display(s)	HP ZR30W 30" 2650x1600 IPS
Case	Corsair 600T SE
Audio Device(s)	Xonar Essence STX \| Sennheisser PC350 "Hero" Modded \| Corsair SP2500
Power Supply	ABS SL 1050W (Enermax Revolution Rebadge)
Software	Windows 8.1 x64 Pro w/ Media Center
Benchmark Scores	Ducky Year of the Snake w/ Cherry MX Browns & Year of the Tiger PBT Keycaps \| Razer Deathadder Black

Processor	Core2 Duo E7200 @ 3.6Ghz
Motherboard	ASUS
Memory	4 GB PC6400 @ 950 Mhz
Video Card(s)	PowerColor ATI HD 3870 512 @ 823/1098
Storage	360 GB WesTern
Software	Vista 64

System Name	TOO MUCH RADIATOR! \| The TV Box a.k.a. The Shoebox
Processor	Core i7 4930K @ 4.5GHz \| Core i5 6600K @ 4.5GHz
Motherboard	Asus X79 Rampage IV Extreme \| Asus Z170i Pro Gaming
Cooling	Custom water on CPU and GPU, dual 360mm radiators \| Corsair H80i
Memory	4x 8GB G.Skill TridentX DDR3-1600 \| 2x 4GB G.Skill RipJaws 4 DDR4-3000
Video Card(s)	Sapphire AMD R9 295x2 \| PowerColor AMD HD7970
Storage	Samsung SSD 830 256GB, various others \| 2x 1TB Seagate Barracudas in RAID1
Display(s)	Dell U2713HM 2560x1440 IPS \| Panasonic TC-L32E5 1080p IPS TV
Case	Thermaltake Suppressor F51 (stripped down to hold two radiators) \| Cooler Master Elite 130
Audio Device(s)	RM-DAC -> Xiang Sheng 708b -> Sennheiser HD650 \| HDMI sound device on 7970
Power Supply	LEPA G1600-MA 1600W \| Corsair CX750M 750W
Software	Win 10 64
Benchmark Scores	over 9000 BungholioMarks, "Bitchin' Fast"

Processor	Core2 Duo E7200 @ 3.6Ghz
Motherboard	ASUS
Memory	4 GB PC6400 @ 950 Mhz
Video Card(s)	PowerColor ATI HD 3870 512 @ 823/1098
Storage	360 GB WesTern
Software	Vista 64

Processor	AMD Athlon 64 X2 7750 Kuma Black Edition @ 3.2GHz 16x200
Motherboard	ASUS M3A78-EM AM2+/AM2 AMD 780G HDMI Micro ATX AMD Motherboard
Cooling	XIGMATEK Dark Knight-S1283V Long Life Bearing CPU Cooler
Memory	OCZ Platinum 2GB (2 x 1GB) DDR2 800 & Corsair Dominator (2 x 1GB) DDR2 1250
Video Card(s)	HIS Radeon HD 5770 1GB 128-bit GDDR5
Storage	Western Digital 3.25 Inch SATA 320GB Drive
Display(s)	SAMSUNG ToC T240HD Rose-Black 24" 5ms HDMI Widescreen HDTV Monitor
Case	LIAN LI Lancool PC-K62 Mid Tower Computer Case
Audio Device(s)	Onboard Realtek ALC1200 8 Channel Audio
Power Supply	Corsair 650HX ATX12V SLI Ready 80 PLUS Certified Modular PSU
Software	Windows 7 Ultimate x64 Proffesional

System Name	I7 build
Processor	I7 930
Motherboard	EVGA x58 SLI LE
Cooling	STOCK
Memory	3X2gb g-skill
Video Card(s)	xfx 6950u
Storage	W750b raid 0
Display(s)	Vizeo 26" LED LCD
Case	Rocketfish
Power Supply	tx850

System Name	Lian Li Carbon fiber ed.
Processor	Intel i5 2500k 4.6Ghz 24/7 Max OC 5Ghz
Motherboard	Asrock Z68 Extreme3 Gen3
Cooling	Swiftech blocks, 360 Xflow rad, Swiftech 120 rad, Liang with XSPC res/pump top.
Memory	8Gb Mushkin 1600Mhz 8-9-8-24
Video Card(s)	Sapphire HD6950 2Gb
Storage	OCZ Vertex 4 128 / Western Digital 160
Display(s)	ASUS 25,5" wide VW266h
Power Supply	Corsair HX620 modular
Software	Windows 7 64

System Name	Rubens
Processor	Intel Core I5 3570K
Motherboard	MSI Z77 Mpower
Cooling	Air
Memory	DDR3 8 Gigs
Video Card(s)	2 AMD Radeon HD 7850 Crossfire
Storage	3 Sony Hard drives
Display(s)	LG 24"
Case	ThermalTake X Series
Audio Device(s)	Realtek onboard
Power Supply	Antec 650
Software	Windows 7
Benchmark Scores	Not OCed yet 3.40

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