Dell's stock more than doubled in two years but the shares still trade at reasonable valuation ratios. Is the computer builder a no-brainer buy today?Computer systems builder Dell (DELL -3.58%) is experiencing a golden age. The company builds a ton of servers to train or operate artificial intelligence (AI) systems nowadays, and its stock has soared since the ChatGPT boom started.Dell shares have jumped 127% over the last two years. That's nowhere near the 430% increase AI chip leader Nvidia (NVDA 3.78%) po ...