Tom's Hardware > Forum > Graphic & Displays > ATI > 3870 2D clock staying at 800mhz

3870 2D clock staying at 800mhz

Forum Graphic & Displays : ATI - 3870 2D clock staying at 800mhz

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50bmg   05-30-2008 at 02:02:50 AM

I thought the gpu clock of the 3870s were supposed to clock down to 300Mhz for 2d applications. Mine is staying at 800Mhz.

------------------------------ gigabyte GA-EX38-DS4|Intel C2Q Q9550 @ 3.4G | Sapphire Vapor-x 4870 1G CCC 9.6|4G PNY DDR2 800MHz 5-5-5-12|500G Seagate SATA II HD|Sunbeam core contact cooler 120mm|BFG Tech 800w| Win XP sp2| Antec 1200
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50bmg   05-31-2008 at 06:02:49 PM
- 0 +

oh yeah, CCC 8.5. The visiontek is the OC'd version.


Message edited by 50bmg on 05-31-2008 at 06:03:27 PM
------------------------------ gigabyte GA-EX38-DS4|Intel C2Q Q9550 @ 3.4G | Sapphire Vapor-x 4870 1G CCC 9.6|4G PNY DDR2 800MHz 5-5-5-12|500G Seagate SATA II HD|Sunbeam core contact cooler 120mm|BFG Tech 800w| Win XP sp2| Antec 1200
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50bmg   06-01-2008 at 06:24:47 PM
- 0 +

Come on guys. i know one of you can help.

Reply to 50bmg
jimmysmitty   06-02-2008 at 05:55:29 PM
- 0 +

Im not sure about your GPU but my HD2900Pro does the same thing. But thats normally after a game. When does yours do it?

------------------------------ http://www.steamcalculator.com/76561197970703804/camo_sig.png
 Reply to jimmysmitty
50bmg   06-02-2008 at 07:45:39 PM
- 0 +

That is the thing. This Visiontek card is the OC edition. It is staying at 800Mhz for 2d apps. My last sapphire 3870 had a 300Mhz 2d clock and 700Mhz for 3d apps.

I am thinking i need to return it if the clocks arent working properly.

So, Aren't the 38xx cards supposed to run at 300mhz for 2d applications?

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smalltime0   06-04-2008 at 04:19:58 PM
- 0 +

I dont think the X2 can underclock itself when overclocked with the current drivers...

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soundefx   06-05-2008 at 10:04:13 PM
- 0 +

By any chance, is this the best buy HD3870 $129 card?
If it is, I am having the same problem. The difference with me is that my MB sometimes shows it at x4 rather than x16, so I don't know if my MB is causing the issue with my card.
I wish someone had an answer to this problem.

Reply to soundefx
Vokofpolisiekar   06-06-2008 at 08:52:38 AM
- 0 +

What are you using to check the clocks?

Reply to Vokofpolisiekar
smalltime0   06-06-2008 at 02:03:07 PM
- 0 +

^the CCC does it...

I miss read the post, I thought you were talking about the x2

Its probably Visionteks setup doing it...

Soundefx that sounds as if it is working as part of a quad crossfire setup

Reply to smalltime0
soundefx   06-08-2008 at 06:48:47 AM
- 0 +

My MB is not a crossfire board. I only have one card in it and the pci-e slot runs at x16 most of the time. But when I randomly check gpu-z it shows the card running at x4.

Reply to soundefx
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