About Us Contact Us Order Status & Tracking Register & Log In My Cart
Computer Hardware PCs & Barebones Laptops Tablets Electronics Software Tools Deals
Browse Top Categories
Special Offers

Featured Products
*Free Economy Shipping* iView CyberPad iView-788TPC 7in 8GB Tablet Quad Core 1GB RAM Android 4.2
*Free Economy Shipping* iView CyberPad iView-788TPC 7in 8GB T...
Only $52.99

Mushkin Blackline 16GB (2x8GB) 240-Pin DDR3 1600MHz (PC3-12800) Dual Channel Kit Desktop Memory 997112, 9-9-9-24, 1.35V, w/ Ridgeback Heatsink
Mushkin Blackline 16GB (2x8GB) 240-Pin DDR3 1600MHz (PC3-1280...
Only $135.99

*Free Economy Shipping* Gray/Black Targus Notebook Slip Case CVR200 fit up to 16-inch Laptop, Neoprene Material
*Free Economy Shipping* Gray/Black Targus Notebook Slip Case ...
Only $9.99

Logitech 920-003402 Keyboard Case for iPad 2 Wireless Keyboard, Refurbished
Logitech 920-003402 Keyboard Case for iPad 2 Wireless Keyboar...
Only $19.99

Home >> Resources | Support >> How to Upgrade Computers >> 

What is 1.5V AGP and .8V AGP?

What is 1.5V AGP and .8V AGP?

By Lee Penrod

You are encouraged to make links to this article from your website and tell your friends

The following article is based on years of experience. It is provided as a free service to our customers and visitors. However, Directron.com is not responsible for any damage as a result of following any of this advice.

Copying the contents for commercial purposes is strictly prohibited without Directron.com's written consent. However, you are welcome to distribute these computer support tips free to your friends and associates as long as it's not for commercial purposes and you acknowledge the source. You are permitted and encouraged to create links to this page from your own web site.

The title of this article is currently one of the most asked questions of our sales department. This article will take a look at this issue and educate you about the topic.

Who needs a 1.5V AGP card?

1.5V AGP cards have increasingly become a requirement of new motherboards/chipsets. If a motherboard requires a 1.5V AGP card and you place a AGP card in it that is not 1.5V, you will physically damage the motherboard and probably the video card as well. The following chipsets are known to require 1.5V AGP.

  • Intel
    1. i845-all versions/variants
    2. i850-all versions/variants
    3. i850E-all
    4. sis-all for P4
  • AMD
    1. All Force chipsets including 220D,220,420,420D,415,415D
As a rule of thumb it is best to use a 1.5V AGP card with a new motherboard if there is any doubt.(Especially true for Intel based systems P4 and above.)

What cards are 1.5V AGP?

The good news is that almost all 4x AGP cards support 1.5V. For convenience here is a rough list of graphic card types that are almost always compatible.

  • Geforce2, Geforce2 MX, Geforce2 MX200/MX400
  • Geforce2 ultra/Pro/GTS/Ti
  • Geforce3/Ti200/Ti500
  • Geforce4-ALL
  • ATI Radeon DDR
  • ATI Radeon 7000/7200/7500/8500/8500LE/9000/9500/9700

Please note that this list is not all inclusive. If you are wondering if a certain card is compatible and is older than those listed above please see the next section.

Is my AGP card 1.5V?

Luckily there is a easy way to distinguish a 1.5V card from a non-1.5V card. The bottom of the connector that goes into the AGP slot is keyed differently. An incompatible card will look like the picture below:

Notice that the bottom connector has only one notch. A compatible card will have a connector like the one below:

Most motherboards that can only use 1.5 volt have a slot that is incompatible with the older single notched connector - however, there may be exceptions to this rule so check before trying to insert a new card. Inexperienced system builders have been known to force the wrong AGP card into a 1.5V slot often with disastrous results!

Isn't AGP backwards compatible?

Yes, and No. Older 2X AGP cards do not use the right voltage to function properly in the newer 1.5V AGP slots. If forced into a 1.5V AGP slot, a non-1.5V compliant video card will damage the motherboard. On the other hand a 1.5V AGP card is usually backwards compatible with older 2X AGP slots.

What is .8V AGP?

.8V is the voltage requirement of new 8x AGP cards utilizing AGP specification 3.0. Motherboards supporting 8x AGP support both 1.5V AGP 2.0 compliant cards (AGP 4x) and newer .8V AGP 3.0 compliant cards (AGP 8x). The keying for AGP 3.0 cards is identical to that of AGP 2.0 cards to retain backward compatibility. A motherboard that supports 8x AGP should work fine with a 1.5V (AGP 4x video card), and a motherboard that supports 1.5V (AGP 4x) video cards should work ok with a .8V video card (AGP 8x), however in the later example the video card would only work at the fastest speed the motherboard supports (AGP 4x).

Directron.com is not responsible for any damage or problem as a result of following the instructions outlined in this manual. Do it at your own risk.

Last Updated: 4/25/03

(c) Directron.com, All rights Reserved.

If you find this article useful, please create a link to it from your website or tell a friend about it. If you have any comments or suggestions about this article, please email information@directron.us

Customer Feedback through Yahoo!
Join our Newsletter

Shipping Policy Customer Service Payment Policy
  Tracking Orders
  Est. Shipping Cost
  Time-in-Transit Map
  FAQ - Shipping
  Top Reasons for Delays
  UPS, FedEx, Postal Office
  Walk-in Sales
  APO/FPO Orders
  Return Policy
  Account Applications
  Frequent Errors
  FAQ-Tech Support
  Order Status
  Credit Card via Phone
  Purchase Order
  Prepay, PayPal
  Resellers, VARs
  Educational Government
  Terms & Conditions
  Price & Tax
Directron.NET- Help Desk Directron.ORG - Resources Short Cuts
  Sales Support
  Tech Support
  Knowledge Base
  Customer Service
  Open Forums
  Advanced Search of Help Desk
  How to Choose?
  FAQs, Glossary
  How to Upgrade?
  Top Sellers
  New Products
  Quiet Computers
  Water Cooling
  Case Painting

Directron Facebook Directron Twitter Directron Google+ Directron RSS Feed Directron YouTube Directron Newsletter Sign Up

Rated 5-Star by Customers thru Yahoo! BBB Online Reliability Program Directron BizRate Ratings

Copyright (c) 1997-2015 Directron.com, Houston, Texas. Prime Systems

LG 20M35D-B 20in LED Backlight Monitor (Black) 5ms DVI / D-Su...
Only $91.99

Antec KUHLER H2O 950 Dual Fans Liquid CPU Cooler H2O950, for ...
Only $76.99

Antec EarthWatts EA-550 GREEN 550W Power Supply, 80 PLUS Bron...
Only $68.99

*Free Economy Shipping* Crucial Ballistix 8GB (2x4GB) DDR3 24...
Only $65.99

Crucial CT2K4G3ERSLS4160B 8GB(4GBx2) 240-Pin DDR3 1600 (PC3-1...
Only $99.99

Canon imageCLASS Color Laser Printer LBP7660Cdn, 300 Sheets C...
Only $279.99

*Free Ground Shipping* Canon 9540B013 imageCLASS MF227dw Wire...
Only $159.95

Mushkin atom 64GB USB 3.0 Flash Drive MKNUFDAM64GB...
Only $23.99

*Free Economy Shipping* Mushkin 996995F Blackline 8GB (2x4GB)...
Only $68.99

Raspberry Pi 2 Model B, 900MHz Quad-Core ARM Cortex-A7 CPU, 1...
Only $39.99

X-MEDIA XM-SW1008D 8-Ports 10/100Mbps Desktop Switch...
Only $9.99

*Free Ground Shipping* Iview Dual-Clone 2-Bay Docking Station...
Only $29.99

Iview SupraPad i-1000QW 10.1in 16GB Tablet PC with Keyboard C...
Only $159.99

CyberPower 1000VA BRG1000AVRLCD UPS with 600W, AVR, LCD, and ...
Only $114.95

CyberPower P600WSU Home Office 8 Outlets Surge, 6 Swivel Outl...
Only $12.95

Fractal Design Black Pearl Define R4 Steel Silent ATX Mid To...
Only $104.99