Re:CrossFire Limitations...? - MVKTech Support Forums :: mvk.tech :: NVIDIA GeForce GTX 280 GTX 260 9800 GX2 9600 GT 8800 GTX ATI Radeon HD 4870 HD 4850 HD 3870 X2 HD 3850 2900 XTX

Forums

TreatYouGoods
Camera Digital Cameras Video Cameras

Main Menu

Getprice Comparison
Digital Cameras

Latest Downloads

Nov.30	Galaxy 9800GT PCIe 512MB - Rev 01
Nov.30	XFX 9600GT (X3) PCIe 512MB - Rev 04
Nov.30	XFX GTX260 (BL) PCIe 896MB - Rev 02
Nov.23	ASUS 9800GT+ (MX) PCIe 512MB - Rev 01
Nov.23	Galaxy 8500GT (LP) PCIe 512MB - Rev 01

Price Comparison
Comparison shopping Laptop Tomtom Digital Camera Mobile Phones Ink cartridges VOIP Shopbot NZ Shopbot ZA

Top Downloads

592388	Omega WinXP2k v1.6693
320614	Omega WinXP2k v1.4523a
229470	nvFlash v5.13
224119	NiBiTor v3.2
164147	RaBiT v2.2.1

MVKTech Support Forums

home | post reply | threaded view | help

Boardwalk :: Forum List

ATI Graphics Cards

ATI Radeon Series

Mavke
Admin

Admin

Posts: 14234

Karma: 360

CrossFire Limitations...? - 2005/09/16 15:18 Well seems that CrossFire will have his limits... Someone suggested we look at the SiI 1161 chip capabilities and we discovered what appear to be a major limitation of ATI's CrossFire concept. You all know by now that ATI needs a Master card with a special PCB and a SiI 1161 chip to gather the signal from a Slave card. The Slave card is any X850 or X800 unit that you can already buy. This Silicon Image SiI 1161 chip is gathering both signals as sending it to your display.

It turns out that this chip works at 165MHz and if you do some very complex maths you can find out that this chip can support 1600x1200 resolution at maximal 60Hz. By any standards 60Hz is not enough for a good refresh rate on a CRT while it's enough for LCDs due to its different way of working. We also learned that this chip will be able to do 1280x1024 at 85Hz. We discovered that for 1600x1200 at 75Hz you need at least 202.5MHz clocked chip while for 1600x1200 at 85Hz you need the chip that works at 229.5MHz...
CrossFire limited to 1600x1200 at 60Hz...

| | The administrator has disabled public write access.

Mavke
Admin

Admin

Posts: 14234

Karma: 360

Re:CrossFire Limitations...? - 2005/09/16 15:20 Followingup on our ATI story, where we wrote that ATI cannot do more than 1600x1200 at 60Hz, we managed to find screenshots from the official CrossFire platform. This chipset and the master card edition X850 XT PE cards scheduled for Monday the 26th launch and we managed to get some shots of the machine actually running.

It turns out that you cannot set higher refresh rate than 1600x1200 at 60Hz, we were right about that. However, you will be able to use 1920x1200 but you will be limited to 52Hz only. Both cases are fine for all TFT users as 60Hz on those displays by some miracle looks very good.
CrossFire does 1600x1200 at 60Hz or 1920x1200 at 52Hz

| | The administrator has disabled public write access.

Mavke
Admin

Admin

Posts: 14234

Karma: 360

Re:CrossFire Limitations...? - 2005/09/20 12:54 We managed to confirm that even the next generation ATI cards will suffer from the SiI 1161 chip limitation. This is something that it won't be able to fix for a while. Several sources who had CrossFire kits in their hands confirmed that with a CRT capable of higher resolution they could not go at higher refresh rates than 1600x1200 at 60Hz.
CrossFire is 1600x1200 at 60Hz or 1920x1200 at 52Hz

| | The administrator has disabled public write access.

Boardwalk :: Forum List ATI Graphics Cards ATI Radeon Series

Joomlaboard Forum Component 1.1.2 Stable
Two Shoes M-Factory

Compare Prices
Shopbot.ca LCD TV GPS Digital Cameras Mobile Phones Laptops LCD Monitors MP3 Players Appliances

Online Casino

New Reviews

	Gainward GeForce GTX 260 Standard Version
	Gainward BLISS 9800 GX2 Dual-GPU Version
	PowerColor Radeon HD 3650 Xtreme Cooling
	Dragon Lasers Hulk Green Laser Technology
	Gainward BLISS 8800 GT 1GB Golden Sample

New Previews

	NVIDIA GeForce 9800 GX2 Dual-GPU Version
	PowerColor Radeon HD 3850 Xtreme Edition
	PowerColor Radeon HD 2600 XT 256MB Card

Support Us

Support MVKTech in making a small donation:

MyPMS Professional

Inbox
	You have 0 new message(s).

Joomla! is Free Software released under the GNU/GPL License.