Newcastle came from behind against the Saints courtesy of goals from Moussa Sissoko, Papiss Cissé, Yohan Cabaye and Jos Hooiveld’s own goal, to move six points clear of the bottom three.
The Magpies were the busiest club in the Premier League last month, strengthening their side in a bid to move clear of relegation danger after a miserable run of results.
Pardew snapped up Mathieu Debuchy, Mapou Yanga-Mbiwa, Yoan Gouffran, Massadio Haidara and Moussa Sissoko from Ligue 1 after Demba Ba joined Chelsea last month.
“Six weeks ago we wouldn’t have won that game,” said Pardew.
“Losing Demba Ba, losing Yohan Cabaye, losing Steven Taylor and playing a lot of the season without Fabricio Coloccini and Cheik Tiote, it takes its toll.
“At this level you need your best players on the pitch, and we have that now. We’ve come on recently and we needed to. We have 30 points, we’re three points off 10th, we’re in the Europa League and we’re looking good in it and suddenly our season is turning.
“There’s a different feel to the club now and everybody’s contributed. If we didn’t have the financial input from [club owner] Mike Ashley we wouldn’t be in this position, and we needed it.”