If you believe the conjecture, the Catalyst 8.8 driver should introduce a considerable performance improvement in CrossFire mode. Particularly when it comes to communication between two graphics cards, ATI is able to optimize in many games.
ATI RadeonTM HD 4800 series graphics cards provide support for the Microsoft® Windows Vista® operating system and take advantage of the Windows AeroTM graphical interface. You will be amazed by the dazzling 3D visual effects and have peace of mind that the ATI CatalystTM software and drivers are designed and thoroughly tested to ensure full compatibility and stability to help keep you up and running. All these new technologies and features make the ATI Radeon HD 4800 series of GPUs the ideal solution for ultimate HD gaming and HD video entertainment with the Windows Vista OS
Here we see at 2560x1600, where all of our multi-GPUsolutions struggled to get through the menus and into the game, our4870 X2 shows a performance increase that illustrates good scaling. It is likely that the extra 512MB of RAM available to each GPU has significantly impacted perforamnce since we are testing with all the options cranked up and 4xAA. It may be possible that the R700 hardwareoffers tangible advantages over AMD's previous method of performingCrossFire, but we can't know if this could be the case with the memory difference being such a likely culprit here.
It does make sense, on a high end part, to target an audience that will be pushing memory limits as far as possible. While gamers who want a single 4870 might not want to run at 2560x1600, it really doens't make much sense right now to go with a hugely expensive card unless you want that kind of resolution. This does add an advantage for R700 over two card crossfire at the moment (which may or may not go away after the introduction of 1GB 4870 cards).
If unsure, try this open source driver first, it will suit most needs and is generally less problematic. See the feature matrix to know what is supported and the decoder ring to translate marketing names (e.g. Radeon HD4330) to chip names (e.g. R700).
The radeon driver supports the activation of a heads-up display (HUD) which can draw transparent graphs and text on top of applications that are rendering, such as games. These can show values such as the current frame rate or the CPU load for each CPU core or an average of all of them. The HUD is controlled by the GALLIUM_HUD environment variable, and can be passed the following list of parameters among others:
Thermal sensors are implemented via external i2c chips or via the internal thermal sensor (rv6xx-evergreen only). To get the temperature on asics that use i2c chips, you need to load the appropriate hwmon driver for the sensor used on your board (lm63, lm64, etc.). The drm will attempt to load the appropriate hwmon driver. On boards that use the internal thermal sensor, the drm will set up the hwmon interface automatically. When the appropriate driver is loaded, the temperatures can be accessed via lm_sensors tools or via sysfs in /sys/class/hwmon.
Independent dual-headed setups can be configured the usual way. However you might want to know that the radeon driver has a "ZaphodHeads" option which allows you to bind a specific device section to an output of your choice:
The radeon driver will probably enable vsync by default, which is perfectly fine except for benchmarking. To turn it off, try the vblank_mode=0 environment variable or create ~/.drirc (edit it if it already exists) and add the following:
This is a solution to the no-console problem that might come up, when using two or more ATI cards on the same PC. Fujitsu Siemens Amilo PA 3553 laptop for example has this problem. This is due to fbcon console driver mapping itself to the wrong framebuffer device that exists on the wrong card. This can be fixed by adding this to the kernel boot line:
If you use 390X (or perhaps similar models) and the 4k output from DP, you may experiencing occasional horizontal artifacts / flickering (i.e. every half an hour or so, a horizontal strip of pixels with a height of ~100 pixels across the whole screen's width shaking up and down for a few seconds). This might be a bug of the radeon driver. Changing to AMDGPU seems to fix it.
My computer is connected to my receiver using an HDMI cable and the DVI to HDMI adapter I received with the graphics card - ATI Radeon 4870. On my old system (Vista 64 bit) everything worked well, and the playback devices showed the HDMI output transfering 5.1 and it was indeed doing it (I could hear 5.1 audio out of the speaker system).
I recently installed Windows 7 64 bit, and installed the Realtek HD audio driver R2.14 which enables me to select 5.1 audio in the playback devices configuration window. this is the same procedure I did for my old system.
Have you tries using Windows own driver for your sound card? If there is any you can change the output under "Control Panel".Under Hardware Setting, right click your Sound Card and update the driver using MS drivers.
I noticed in the device manager that the driver that was installed was not the Realtek ATI HDMI driver, even though I installed it. So I updated the driver and choose the Realtek driver manually (I think it was called HDXATI64.inf, or something like that). 2b1af7f3a8