Aha…
Entonces porque la página de Sapphire in las especificaciones técnicas dice esto (copio en rojo):
(copiado de la página web de Sapphire)…
SAPPHIRE TOXIC HD 4890 1GB GDDR5 PCI-E
SAPPHIRE Toxic 4890 Enthusiast Card with Enthusiast Cooling
The SAPPHIRE HD 4890 TOXIC uses the same configuration of Vapor-X and heatpipe cooling technology as the ATOMIC Edition. It is factory overclocked with a high speed core clock of 960MHz as well as 1GB of GDDR5 memory with clocks of 1050MHz to give stunning performance straight out of the box. Two dual-link DVI ports are provided as well as TV out. HDMI and VGA are supported with dongles.
Go Beyond HD Video
-
Unified Video Decoder 2 (UVD 2)
UVD 2 frees up your CPU for other tasks so you get The Ultimate Visual Experience
for even the most processing-intensive content, including VC-1, H.264 and now MPEG-2. Also, take full advantage of Blu-ray functionality with dual-stream, picture in picture (PIP) capabilities1,2. -
Accelerated Video Transcoding (AVT)
With ATI Stream technology, owners of ATI Radeon HD 4800 series graphics cards can help accelerate the conversion of standard and HD video into multiple formats for use on differing consumer electronics devices. The ATI Video Converter, designed to enable GPU transcoding of HD video streams, is currently available. -
Upscale Beyond 1080p
Watch the hottest Blu-ray movies or other HD content at full 1080p display resolution and beyond3. -
Enhanced DVD Upscaling
Watch standard DVD movies in near high-definition quality with DVD upscaling. The GPU uses post processing algorithms to enhance standard and low resolution videos and movies on your HD display. -
Dynamic Contrast
Dynamic Contrast automatically adjusts the contrast and brightness during scenes to consistently deliver a crisp, vibrant picture.
===> *** HDMI
Enjoy the latest audio technologies using HDMI with 7.1 digital surround sound support. Also, xvYCC support allows the user to enjoy a wider range of color when connected to a capable HDTV.**
ATI Avivo HD video and display technology2
- Unified Video Decoder 2 (UVD 2) for Blu-ray and HD Video
- Accelerated Video Transcoding (AVT)
- DVD Upscaling
- Dynamic Contrast
===> *** Built-in HDMI with 7.1 surround sound support**
I/O Output: Dual DL-DVI-I+HDTV
Core Clock: 960 MHz
Memory Clock: 1050 MHz, 4.2 Gbps
PCI Express 2.0 x16 bus interface
1024MB /256bit GDDR5 memory interface
Dual Slot Vapor-X Cooler with Heatpipes
HDMI compliant via dongle
===> 7.1 Audio Channel Support
Microsoft
DirectX 10.1 support
Shader Model 4.1 support
Quien quiera ver las especificaciones directamente desde la página de Sapphire, aqui dejo el link:
http://www.sapphiretech.com/presentation/product/?psn=0001&pid=258
¿Si no tiene soporte de sonido… por qué las especificaciones técnicas de Sapphire (que he copiado más arriba) dicen que si tiene soporte de sonido?
Por lo que se dice, a mi me parece que se tiene que poder conectar la tarjeta de sonido a la gráfica para sacar el audio por la gráfica… pero si alguien sabe como va esto, a ver si me lo puede explicar claro. Y si no soporta sonido, entonces a ver si me podéis decir pq las especificaciones técnicas sacadas de la web de sapphire dicen que soporta sonido: 7.1 Audio Channel Support, Built-in HDMI with 7.1 surround sound support, Enjoy the latest audio technologies using HDMI with 7.1 digital surround sound support.
Sigo sin aclararme nada la verdad… 
