，三年的顯示卡隨便挑現在中等的，就會覺得效能大躍進了！
"What about this other card that’s not on the list? How do I know if it’s a good deal or not?
This will happen. In fact, it’s guaranteed to happen, because inventory levels and prices change quickly. So how do you know if that card you’ve got your eye on is a good buy in its price range?
Here are two resources to help you judge if a card is a good buy or not. The first is the graphics card hierarchy chart, which groups graphics cards with similar overall performance levels into tiers. The top tier contains the highest-performing cards available and performance decreases as you go down the tiers from there.
You can use this hierarchy to compare the pricing between two cards, to see which one is a better deal, and also to determine if an upgrade is worthwhile. I don’t recommend upgrading your graphics card unless the replacement card is at least three tiers higher. Otherwise, the upgrade is somewhat parallel and you may not notice a worthwhile difference in performance.
At the request of readers, I have added mobile graphics and integrated chipsets to the hierarchy chart. I want to make it clear that there is very little performance data available for these graphics solutions. While the discrete video cards in the chart are placed in tiers based on a lot of information, many of the mobile and integrated devices in the chart are guesstimates based on their specifications. At worst, I don’t think they’re more than one tier away from their actual performance, but this is something to keep in mind when considering mobile graphics chipsets."
這款不在清單上的顯示卡怎麼樣？我怎麼知道這款顯示卡划不划算？
這是有可能的。事實上，這種狀況一定會發生。因為庫存數量和價錢變化得很快。那麼你該怎麼判斷你看到的這款顯示卡在這個價格帶而言划不划算？
這裡有兩個參考資源可以協助你判斷值不值得買。第一是顯示卡分級表，這個表會將整體效能相仿的顯示卡分成若干個等級。最上面一級是效能最高的顯示卡，等級越低，效能也越低。
你可以用這個分級表比較兩款顯示卡的價格，看看哪一款比較划算，同時判斷值不值得升級。通常新顯示卡要比舊的高三級以上，我才會建議升級顯示卡。否則的話，升級其實意義不大，你或許也感覺不出效能有什麼差別。
在讀者要求下，我將行動型和整合型晶片組加入了分級表。這裡要特別說明的是，這類顯示解決方案的效能相關資料非常少。雖然獨立顯示晶片組在表中的位置是參考了很多資料才決定的，但有許多筆記型電腦晶片組的位置是依據規格估計出來的。我認為它們在表上的位置跟實際效能的差距頂多不會超過一級，但在研究行動型顯示晶片組時，這點還是要特別留意。
重點是湯姆大叔的表是把測試分數接近的放在一起，而不是以製程和價位做為考量，像9800GTX=GTS 250=HD 4850這是很合理的，且280和285放在一起因285是280的強化版本，放在同一階並無不妥
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