Diamond Multimedia's Viper V330 Featured in Computer City's Wingen 5830 Desktop System.

SAN JOSE, Calif.--(BUSINESS WIRE)--Feb. 18, 1998--Diamond Multimedia Systems, Inc.(NASDAQ:DIMD), a leader in the interactive multimedia acceleration market, announced today that its award-winning high-end consumer multimedia accelerator, the Viper V330, is the graphics subsystem in a Computer City house-brand desktop system, the Wingen 5830. The Wingen 5830 with 32MB of system memory features the AGP version of the Viper V330 and a 300 MHz Pentium II-based processor for a retail price of $1,999.00

"The Wingen 5830 system is filled with quality components, and we are honored that Computer City has chosen the Viper V330 as their graphics subsystem,"said Scott Holt, senior vice president of worldwide sales at Diamond Multimedia. "With its true 128-bit performance and AGP texture storage, the Diamond Viper will provide fast PC performance for tasks such as 2D business applications, the latest 3D accelerated games and Internet video content playback."

"The Viper V330, a high-end integrated 2D, 3D and MPEG-1 video accelerator, is exactly the kind of quality product we wanted to power the graphics in our Wingen 5830 system," said Stephen Dukker, senior vice president of merchandising and direct operations at Computer City. "The Wingen 5830 brings consumers the performance benefits of AGP graphics and Pentium II processing for under $2,000."

Diamond Multimedia's Viper V330

Diamond Multimedia's Viper, model V330, multimedia accelerator, based on NVIDIA's Corp.'s Riva 128(TM) media controller, is a true 128-bit solution for accelerating 2D/3D graphics and MPEG-1 digital video playback. With AGP-support and 4MB of SGRAM, Diamond's Viper V330 is capable of displaying resolutions up to 1920 x 1200 and color depths up to 32-bit true-color. A 230MHz RAMDAC provides flicker-free refresh rates of up to 200Hz. The Viper features optimized drivers for running in Windows 95, Windows 3.51 and Windows NT 4.0 environments with support planned for Windows 98. A high-quality 3D performer with a rich 3D feature set, the Viper V330 is optimized for software titles developed using Microsoft's Direct3D application programming interface (API).

Computer City

With 96 locations throughout the U.S.and Canada, Computer City is North America's premier provider of personal computer products. A subsidiary of Fort Worth, Texas-based Tandy Corporation (NYSE:TAN), the company offers more than 5,000 different items from leading technology vendors, plus private-label build-to-order systems featuring name-brand components.

By offering personal services for personal computers, Computer City's Corporate Sales department and Business Solutions Centers (in select locations) provide total computing solutions for individuals and small businesses, as well as government, education and corporate accounts. In addition, the company offers training, technical support, computer set-up and delivery, an on-line catalog for comparison shopping, and Internet purchasing options.

Diamond Multimedia

Diamond Multimedia is driving the interactive multimedia market by providing advanced solutions for home, business and professional desktop computer users, enabling them to create, access and experience compelling new media content from their desktops and through the Internet. Diamond accelerates multimedia from the Internet to the hard drive with products that include the Stealth and Viper(R) series of media accelerators, the Monster series of entertainment 3D and sound accelerators, the Fire series of professional 3D and SCSI accelerators, and the Supra(R) series of modems. Diamond also markets DVD and video phone kits. Diamond's common stock is traded on the Nasdaq Stock Market under the symbol DIMD, and its web site address is www.diamondmm.com.

How to Contact Diamond Multimedia

There are many ways to reach Diamond for sales support, technical assistance, driver updates and general information: -0- Internet Web Site: http://www.diamondmm.com Diamond Multimedia's Headquarters and Multimedia Division:

408-325-7000; Fax: [phone] Communications Division (Supra brand modems) Main Phone Number:

360-604-1400; Fax: [phone] European Division (Germany): [phone]; (UK): [phone];

(France) [phone] Korean Office (Seoul): [phone]; Fax: [phone] Japanese Office (Tokyo): [phone]; Fax: [phone] ASEAN Office (Singapore): [phone]; Fax: [phone] Hong Kong Office: [phone]; Fax: [phone] Australian Office (Sydney): [phone]; Fax [phone] Product Support (Voice), United States: 541-967-2450; Europe (Germany)

[phone]; Europe (UK) [phone]; TDD/TTY Support

541-967-2451 Product Support (Fax), United States: 541-967-2401; Europe (Germany)

[phone]; Europe (UK): [phone]; (France)

[phone] Pre-sales Information: 1-800-468-5846 Investor Relations: 408-325-7476; 1-888-474-3463 (U.S. and Canada) 24-Hour Fax-On-Demand Service: 1-800-380-0030 FTP site: ftp.diamondmm.com BBS: 541-967-2444 (to 33.6 Kbps) or 408-383-0551 (ISDN); Europe

(Germany) BBS at [phone] (to 28.8 Kbps) or

[phone] (ISDN); Europe (UK) at [phone] (to 33.6

Kbps) -0-

Note to Editors: Monster 3D and Supra are either trademarks or registered trademarks of Diamond Multimedia Systems, Inc. Monster(R) is a registered trademark of Monster Cable. Viper(R) is a registered trademark of Directed Electronics, Inc., Used under License. All other trademarks referenced are the service mark, trademark or registered trademark of their respective manufacturers. This announcement relates to products whose introductions are in the United States of America. The product name, contents, prices and availability may differ elsewhere in the world according to local factors and requirements.

Except for historical information contained herein, the matters set forth in this press release, such as statements relating to the Company's ability to successfully exploit technological and market developments, the timing and success of new product introductions by the Company and its competitors, and the Company's ability to invest in new technologies and to enhance its existing systems are forward-looking statements that are subject to risks and uncertainties, including the impact of competitive products and pricing and alternative technological advances, the timely and successful development and market acceptance of new products and upgrades to existing products, and other risks as detailed from time to time in Diamond Multimedia's SEC filings, including its most recent Forms 10-K and 10-Q.

CONTACT: Diamond Multimedia Systems, Inc.

Mary Medeiros/Bob Nelson, 408/325-7350/7419

[e-mail]

[e-mail]

or

Computer City

Mieke Henderson, 817/415-7624

[e-mail]