That cake is, indeed, appropriately nerdy.
My dad got something similar. He's been puttering with the soldering iron lately and has also depleted most of his electronics surplus stock recently, so his gift was a massive supply of 1% 0.25W resistors and an assortment of perfboard for custom solder projects. Nothing he couldn't afford to buy himself, but requiring a string of eBay search terms he's unlikely to consider. He was tickled.
Abacus Model 2.5 | Quad-Row FX with 256 Cherry Red Slider Beads | Applewood Frame | Water Cooling by Brita Filtration